tweak the fit of the parts

2026-08-04 12:27:31 -07:00
parent 45a77885f9
commit 69d9b956e6
41 changed files with 5378 additions and 324 deletions
@@ -0,0 +1,31 @@
+# Attitude no battery
+
+Generated by the Feather Case Wizard.
+
+- Top profile: `generic`
+- FeatherWings: 1
+- Battery compartment: no
+- 1/4-20 insert: yes
+- Approximate exterior: 60.8 × 41.7 × 33.2 mm
+- Formats: 3mf
+- Parts: `body`, `lid`, `lid_base`, `lid_accent`
+- Custom cutouts: 0
+
+Run `ruby build.rb` in this directory to regenerate exports and previews.
+OpenSCAD, Blender, and Python 3 must be installed. Set `OPENSCAD`,
+`BLENDER`, or `PYTHON` to override their executable paths.
+
+To open the saved Customizer values manually:
+
+```bash
+openscad -p parameters.json -P attitude-no-battery source/feather_case.scad
+```
+
+The 3MF files contain portable geometry only. Choose printer, filament,
+plate, and slicing settings in Bambu Studio.
+
+For a two-color lid, open `exports/3mf/lid_multicolor.3mf` as one
+multipart object. Assign “Lid base — Filament 1” and “Accent inlays —
+Filament 2” to the desired filaments. `lid.3mf` is the complete
+single-color fallback; `lid_base.3mf` and `lid_accent.3mf` are also
+provided separately.
@@ -0,0 +1,148 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "fileutils"
+require "json"
+require "open3"
+require "pathname"
+require "tmpdir"
+require "yaml"
+
+ROOT = Pathname(__dir__).expand_path
+
+def executable(env_name, command)
+  override = ENV[env_name]
+  return File.expand_path(override) if override && File.executable?(override)
+
+  ENV.fetch("PATH", "").split(File::PATH_SEPARATOR).each do |directory|
+    candidate = File.join(directory, command)
+    return candidate if File.file?(candidate) && File.executable?(candidate)
+  end
+  nil
+end
+
+def literal(value)
+  case value
+  when String then JSON.generate(value)
+  when TrueClass then "true"
+  when FalseClass then "false"
+  when Numeric then value.to_s
+  when Array then "[#{value.map { |item| literal(item) }.join(",")}]"
+  else raise "Cannot convert #{value.inspect} to OpenSCAD"
+  end
+end
+
+def run!(*command, env: {})
+  stdout, stderr, status = Open3.capture3(env, *command)
+  return if status.success?
+
+  warn [stdout, stderr].reject(&:empty?).join("\n")
+  raise "Command failed (#{status.exitstatus}): #{command.first}"
+end
+
+config = YAML.safe_load_file(ROOT.join("case.yml"), permitted_classes: [],
+                             permitted_symbols: [], aliases: false)
+openscad = executable("OPENSCAD", "openscad")
+blender = executable("BLENDER", "blender")
+python = executable("PYTHON", "python3")
+abort "OpenSCAD not found; install it or set OPENSCAD" unless openscad
+abort "Blender not found; install it or set BLENDER" unless blender
+
+parameters = config.fetch("parameters").merge(
+  "extra_cutouts" => config.fetch("resolved").fetch("extra_cutouts")
+)
+artwork = !parameters.fetch("lid_label", "").empty? ||
+          parameters.fetch("lid_logo_enabled", false)
+abort "Python 3 not found; install it or set PYTHON" if artwork && !python
+parts = %w[body lid] + config.fetch("outputs").fetch("coupons")
+parts.concat(%w[lid_base lid_accent]) if artwork
+buttons = %w[button_a button_b button_c button_reset]
+if parameters["top_profile"] == "oled128x64" &&
+   buttons.any? { |name| parameters[name] }
+  parts << "buttons"
+end
+
+stage = Pathname(Dir.mktmpdir(".rebuild-", ROOT.to_s))
+begin
+  exports = stage.join("exports")
+  previews = stage.join("previews")
+  scratch = stage.join("meshes")
+  FileUtils.mkdir_p([exports, previews, scratch])
+  model = ROOT.join("source/feather_case.scad")
+  renderer = ROOT.join("source/render_stl_previews.py")
+
+  export = lambda do |output, part, overrides = {}|
+    values = parameters.merge(overrides).merge("part" => part)
+    command = [openscad, "-o", output.to_s]
+    values.each { |name, value| command.concat(["-D", "#{name}=#{literal(value)}"]) }
+    run!(*command, model.to_s)
+  end
+
+  config.fetch("outputs").fetch("formats").each do |format|
+    directory = exports.join(format)
+    FileUtils.mkdir_p(directory)
+    parts.each do |part|
+      puts "Exporting #{part}.#{format}…"
+      export.call(directory.join("#{part}.#{format}"), part)
+    end
+    if artwork && format == "3mf"
+      puts "Packaging lid_multicolor.3mf…"
+      run!(
+        python, ROOT.join("tools/package_multimaterial_3mf.py").to_s,
+        directory.join("lid_base.3mf").to_s,
+        directory.join("lid_accent.3mf").to_s,
+        directory.join("lid_multicolor.3mf").to_s,
+        "--title", "#{config.fetch("name")} Lid"
+      )
+    end
+  end
+
+  assembly = scratch.join("assembly.stl")
+  puts "Preparing assembly preview…"
+  export.call(assembly, "assembly",
+              "exploded_view" => config.fetch("outputs").fetch("assembly_exploded_view"),
+              "show_references" => false)
+  render_env = {"DISPLAY" => nil, "WAYLAND_DISPLAY" => nil}
+  run!(blender, "--background", "-noaudio", "--python", renderer.to_s, "--",
+       assembly.to_s, previews.to_s, "assembly", env: render_env)
+  parts.each do |part|
+    puts "Rendering #{part} preview…"
+    mesh = scratch.join("#{part}.stl")
+    export.call(mesh, part) unless mesh.file?
+    run!(blender, "--background", "-noaudio", "--python", renderer.to_s, "--",
+         mesh.to_s, previews.to_s, part, "iso", env: render_env)
+  end
+  if artwork
+    puts "Rendering multicolor lid preview…"
+    run!(
+      blender, "--background", "-noaudio", "--python",
+      ROOT.join("source/render_multicolor_lid.py").to_s, "--",
+      scratch.join("lid_base.stl").to_s,
+      scratch.join("lid_accent.stl").to_s,
+      previews.to_s, "lid_multicolor", parameters["lid_art_orientation"], env: render_env
+    )
+  end
+
+  backup = ROOT.join(".build-old-#{Process.pid}")
+  FileUtils.mkdir_p(backup)
+  %w[exports previews].each do |name|
+    current = ROOT.join(name)
+    FileUtils.mv(current, backup.join(name)) if current.exist?
+  end
+  begin
+    FileUtils.mv(exports, ROOT.join("exports"))
+    FileUtils.mv(previews, ROOT.join("previews"))
+    FileUtils.rm_rf(backup)
+  rescue StandardError
+    FileUtils.rm_rf(ROOT.join("exports"))
+    FileUtils.rm_rf(ROOT.join("previews"))
+    %w[exports previews].each do |name|
+      saved = backup.join(name)
+      FileUtils.mv(saved, ROOT.join(name)) if saved.exist?
+    end
+    raise
+  end
+  puts "Rebuilt #{ROOT}"
+ensure
+  FileUtils.rm_rf(stage)
+end
@@ -0,0 +1,94 @@
+---
+schema_version: 1
+name: Attitude no battery
+slug: attitude-no-battery
+generator:
+  sha256: daeb9015a2bd04a16a75b77b32ee84bca2a9e2a4f4fe16605f3d5dc7e6d53036
+  created_with: feather-case-wizard
+parameters:
+  top_profile: generic
+  wing_count: 1
+  wing_pitch: 11.0
+  stack_height_override: 0.0
+  generic_component_height: 3.0
+  generic_top_gap: 2.0
+  gps_antenna_height: 4.0
+  gps_top_gap: 5.0
+  oled_component_height: 2.4
+  oled_face_gap: 0.8
+  button_a: true
+  button_b: true
+  button_c: true
+  button_reset: false
+  button_projection: 1.5
+  button_cap_size:
+  - 5.0
+  - 3.2
+  button_flange_size:
+  - 6.6
+  - 3.6
+  button_flange_thickness: 0.9
+  button_travel: 0.5
+  button_contact_extension: 0.7
+  battery_enabled: false
+  battery_length: 69.0
+  battery_diameter: 18.0
+  battery_radial_clearance: 0.6
+  battery_end_clearance: 1.0
+  battery_partition_thickness: 1.8
+  rocker_cutout_size:
+  - 12.9
+  - 19.4
+  rocker_corner_radius: 0.8
+  rocker_body_size:
+  - 15.0
+  - 21.0
+  - 21.0
+  rocker_artwork_gap: 2.0
+  tripod_insert_enabled: true
+  tripod_insert_length: 5.0
+  tripod_insert_hole_diameter: 7.2
+  tripod_insert_outer_diameter: 8.0
+  tripod_thread_clearance_diameter: 6.8
+  tripod_boss_diameter: 14.0
+  m25_insert_length: 4.0
+  m25_insert_hole_diameter: 3.1
+  m25_insert_outer_diameter: 3.5
+  m25_screw_clearance: 2.8
+  m25_boss_diameter: 7.0
+  insert_entry_chamfer: 0.6
+  insert_melt_relief: 0.8
+  wall_thickness: 2.4
+  floor_thickness: 2.4
+  lid_thickness: 3.2
+  corner_radius: 4.0
+  board_bottom_clearance: 5.4
+  board_side_clearance: 7.0
+  board_rear_clearance: 4.0
+  usb_board_wall_gap: 1.2
+  lid_lip_depth: 2.4
+  lid_lip_thickness: 1.2
+  fit_clearance: 0.35
+  hole_compensation: 0.2
+  lid_screw_head_diameter: 5.2
+  lid_screw_head_height: 2.5
+  lid_label: IMU
+  lid_logo_enabled: true
+  lid_art_orientation: usb_front
+  lid_inlay_depth: 0.6
+  lid_inlay_fit_clearance: 0.08
+  lid_label_size: 5.0
+  lid_label_logo_gap: 2.0
+  lid_art_margin: 8.5
+  usb_opening_width: 12.5
+  usb_opening_height: 7.0
+  usb_opening_radius: 1.5
+  usb_vertical_offset: 0.0
+cutouts: []
+outputs:
+  formats:
+  - 3mf
+  coupons: []
+  assembly_exploded_view: 8
+resolved:
+  extra_cutouts: []
@@ -0,0 +1,76 @@
+{
+  "parameterSets": {
+    "attitude-no-battery": {
+      "top_profile": "\"generic\"",
+      "wing_count": "1",
+      "wing_pitch": "11.0",
+      "stack_height_override": "0.0",
+      "generic_component_height": "3.0",
+      "generic_top_gap": "2.0",
+      "gps_antenna_height": "4.0",
+      "gps_top_gap": "5.0",
+      "oled_component_height": "2.4",
+      "oled_face_gap": "0.8",
+      "button_a": "true",
+      "button_b": "true",
+      "button_c": "true",
+      "button_reset": "false",
+      "button_projection": "1.5",
+      "button_cap_size": "[5.0,3.2]",
+      "button_flange_size": "[6.6,3.6]",
+      "button_flange_thickness": "0.9",
+      "button_travel": "0.5",
+      "button_contact_extension": "0.7",
+      "battery_enabled": "false",
+      "battery_length": "69.0",
+      "battery_diameter": "18.0",
+      "battery_radial_clearance": "0.6",
+      "battery_end_clearance": "1.0",
+      "battery_partition_thickness": "1.8",
+      "rocker_cutout_size": "[12.9,19.4]",
+      "rocker_corner_radius": "0.8",
+      "rocker_body_size": "[15.0,21.0,21.0]",
+      "rocker_artwork_gap": "2.0",
+      "tripod_insert_enabled": "true",
+      "tripod_insert_length": "5.0",
+      "tripod_insert_hole_diameter": "7.2",
+      "tripod_insert_outer_diameter": "8.0",
+      "tripod_thread_clearance_diameter": "6.8",
+      "tripod_boss_diameter": "14.0",
+      "m25_insert_length": "4.0",
+      "m25_insert_hole_diameter": "3.1",
+      "m25_insert_outer_diameter": "3.5",
+      "m25_screw_clearance": "2.8",
+      "m25_boss_diameter": "7.0",
+      "insert_entry_chamfer": "0.6",
+      "insert_melt_relief": "0.8",
+      "wall_thickness": "2.4",
+      "floor_thickness": "2.4",
+      "lid_thickness": "3.2",
+      "corner_radius": "4.0",
+      "board_bottom_clearance": "5.4",
+      "board_side_clearance": "7.0",
+      "board_rear_clearance": "4.0",
+      "usb_board_wall_gap": "1.2",
+      "lid_lip_depth": "2.4",
+      "lid_lip_thickness": "1.2",
+      "fit_clearance": "0.35",
+      "hole_compensation": "0.2",
+      "lid_screw_head_diameter": "5.2",
+      "lid_screw_head_height": "2.5",
+      "lid_label": "\"IMU\"",
+      "lid_logo_enabled": "true",
+      "lid_art_orientation": "\"usb_front\"",
+      "lid_inlay_depth": "0.6",
+      "lid_inlay_fit_clearance": "0.08",
+      "lid_label_size": "5.0",
+      "lid_label_logo_gap": "2.0",
+      "lid_art_margin": "8.5",
+      "usb_opening_width": "12.5",
+      "usb_opening_height": "7.0",
+      "usb_opening_radius": "1.5",
+      "usb_vertical_offset": "0.0"
+    }
+  },
+  "fileFormatVersion": "1"
+}
@@ -0,0 +1,82 @@
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+           id="path251"
+           style="fill:#000000;stroke:none;stroke-width:0.133333" />
+        <path
+           d="m 134.90261,432.74576 c -0.4,0.93334 -0.53333,27.2 -0.4,58.4 l 0.4,56.53333 38.4,-37.06666 38.26666,-37.06667 -0.26666,-20.93333 -0.4,-20.8 -37.73334,-0.4 c -29.46666,-0.26667 -37.86666,0 -38.26666,1.33333 z"
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+           style="fill:#000000;stroke:none;stroke-width:0.133333" />
+      </g>
+    </g>
+  </g>
+</svg>
@@ -0,0 +1,101 @@
+"""Render aligned lid-base and accent STLs with distinct materials."""
+
+import os
+import sys
+import math
+
+import bpy
+from mathutils import Matrix, Vector
+
+
+def import_mesh(path, name, color):
+    bpy.ops.wm.stl_import(filepath=os.path.abspath(path))
+    model = bpy.context.selected_objects[0]
+    model.name = name
+    material = bpy.data.materials.new(f"{name} material")
+    material.diffuse_color = color
+    material.metallic = 0.0
+    material.roughness = 0.45
+    model.data.materials.append(material)
+    return model
+
+
+def look_at(camera, target):
+    direction = Vector(target) - camera.location
+    camera.rotation_euler = direction.to_track_quat("-Z", "Y").to_euler()
+
+
+def main():
+    args = sys.argv[sys.argv.index("--") + 1 :]
+    if len(args) not in (4, 5):
+        raise SystemExit(
+            "expected: lid-base.stl lid-accent.stl output-directory basename [orientation]"
+        )
+    base_path, accent_path, output_dir, basename = args[:4]
+    orientation = args[4] if len(args) == 5 else "usb_left"
+    angles = {"usb_left": 0, "usb_front": 90, "usb_right": 180, "usb_rear": 270}
+    if orientation not in angles:
+        raise SystemExit(f"unknown lid orientation: {orientation}")
+    os.makedirs(output_dir, exist_ok=True)
+    bpy.ops.wm.read_factory_settings(use_empty=True)
+    models = [
+        import_mesh(base_path, "Lid base", (0.16, 0.42, 0.72, 1.0)),
+        import_mesh(accent_path, "Accent inlays", (0.95, 0.42, 0.08, 1.0)),
+    ]
+    # Lid exports are print-oriented with the decorated exterior face down.
+    # Turn both aligned parts over and present the configured USB edge in its
+    # named position so previews inspect the finished face as the user will.
+    for model in models:
+        model.matrix_world = (
+            Matrix.Rotation(math.radians(angles[orientation]), 4, "Z")
+            @ Matrix.Rotation(math.pi, 4, "X")
+        )
+    bpy.context.view_layer.update()
+
+    corners = [obj.matrix_world @ Vector(corner) for obj in models for corner in obj.bound_box]
+    mins = Vector([min(v[i] for v in corners) for i in range(3)])
+    maxs = Vector([max(v[i] for v in corners) for i in range(3)])
+    center = (mins + maxs) / 2
+    span = max(maxs - mins)
+
+    world = bpy.data.worlds.new("Inspection world")
+    world.use_nodes = True
+    world.node_tree.nodes["Background"].inputs["Color"].default_value = (0.035, 0.04, 0.05, 1)
+    world.node_tree.nodes["Background"].inputs["Strength"].default_value = 0.5
+    bpy.context.scene.world = world
+
+    camera_data = bpy.data.cameras.new("Camera")
+    camera = bpy.data.objects.new("Camera", camera_data)
+    bpy.context.collection.objects.link(camera)
+    bpy.context.scene.camera = camera
+    camera.data.type = "ORTHO"
+    camera.data.ortho_scale = span * 1.35
+
+    key_data = bpy.data.lights.new("Key", type="AREA")
+    key_data.energy = 900
+    key_data.size = span
+    key = bpy.data.objects.new("Key", key_data)
+    key.location = center + Vector((span, -span, span * 1.5))
+    bpy.context.collection.objects.link(key)
+
+    scene = bpy.context.scene
+    scene.render.engine = "BLENDER_WORKBENCH"
+    scene.render.resolution_x = 800
+    scene.render.resolution_y = 600
+    scene.render.resolution_percentage = 100
+    scene.render.image_settings.file_format = "PNG"
+    scene.display.shading.light = "STUDIO"
+    scene.display.shading.color_type = "MATERIAL"
+    scene.display.shading.show_shadows = True
+    scene.display.shading.show_cavity = True
+    scene.display.shading.cavity_type = "BOTH"
+
+    for view, direction in {"iso": (1, -1, 0.8), "top": (0, 0, 1)}.items():
+        camera.location = center + Vector(direction).normalized() * span * 2.2
+        look_at(camera, center)
+        scene.render.filepath = os.path.join(output_dir, f"{basename}_{view}.png")
+        bpy.ops.render.render(write_still=True)
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,127 @@
+"""Render six inspection views of an STL using Blender.
+
+Usage:
+    blender --background --python tools/render_stl_previews.py -- \
+        input.stl output-directory basename [comma-separated-views]
+"""
+
+import os
+import sys
+
+import bpy
+from mathutils import Vector
+
+
+def arguments():
+    args = sys.argv[sys.argv.index("--") + 1 :]
+    if len(args) not in (3, 4):
+        raise SystemExit(
+            "expected: input.stl output-directory basename [comma-separated-views]"
+        )
+    requested_views = args[3].split(",") if len(args) == 4 else None
+    return args[0], args[1], args[2], requested_views
+
+
+def look_at(camera, target):
+    direction = Vector(target) - camera.location
+    camera.rotation_euler = direction.to_track_quat("-Z", "Y").to_euler()
+
+
+def render_view(camera, center, span, name, direction, output_dir, basename):
+    distance = span * 2.2
+    camera.location = Vector(center) + Vector(direction).normalized() * distance
+    look_at(camera, center)
+    camera.data.type = "ORTHO"
+    camera.data.ortho_scale = span * 1.35
+    bpy.context.scene.render.filepath = os.path.join(
+        output_dir, f"{basename}_{name}.png"
+    )
+    bpy.ops.render.render(write_still=True)
+
+
+def main():
+    input_path, output_dir, basename, requested_views = arguments()
+    os.makedirs(output_dir, exist_ok=True)
+
+    bpy.ops.wm.read_factory_settings(use_empty=True)
+    bpy.ops.wm.stl_import(filepath=os.path.abspath(input_path))
+    model = bpy.context.selected_objects[0]
+    model.name = "Feather case"
+
+    material = bpy.data.materials.new("Case material")
+    material.diffuse_color = (0.16, 0.42, 0.72, 1.0)
+    material.metallic = 0.0
+    material.roughness = 0.45
+    model.data.materials.append(material)
+
+    corners = [model.matrix_world @ Vector(corner) for corner in model.bound_box]
+    mins = Vector([min(v[i] for v in corners) for i in range(3)])
+    maxs = Vector([max(v[i] for v in corners) for i in range(3)])
+    center = (mins + maxs) / 2
+    span = max(maxs - mins)
+
+    world = bpy.data.worlds.new("Inspection world")
+    world.use_nodes = True
+    world.node_tree.nodes["Background"].inputs["Color"].default_value = (
+        0.035,
+        0.04,
+        0.05,
+        1,
+    )
+    world.node_tree.nodes["Background"].inputs["Strength"].default_value = 0.5
+    bpy.context.scene.world = world
+
+    camera_data = bpy.data.cameras.new("Camera")
+    camera = bpy.data.objects.new("Camera", camera_data)
+    bpy.context.collection.objects.link(camera)
+    bpy.context.scene.camera = camera
+
+    key_data = bpy.data.lights.new("Key", type="AREA")
+    key_data.energy = 900
+    key_data.shape = "DISK"
+    key_data.size = span
+    key = bpy.data.objects.new("Key", key_data)
+    key.location = center + Vector((span, -span, span * 1.5))
+    bpy.context.collection.objects.link(key)
+
+    fill_data = bpy.data.lights.new("Fill", type="AREA")
+    fill_data.energy = 500
+    fill_data.size = span
+    fill = bpy.data.objects.new("Fill", fill_data)
+    fill.location = center + Vector((-span, span, span))
+    bpy.context.collection.objects.link(fill)
+
+    scene = bpy.context.scene
+    scene.render.engine = "BLENDER_WORKBENCH"
+    scene.render.resolution_x = 800
+    scene.render.resolution_y = 600
+    scene.render.resolution_percentage = 100
+    scene.render.image_settings.file_format = "PNG"
+    scene.render.film_transparent = False
+    scene.display.shading.light = "STUDIO"
+    scene.display.shading.color_type = "MATERIAL"
+    scene.display.shading.show_shadows = True
+    scene.display.shading.show_cavity = True
+    scene.display.shading.cavity_type = "BOTH"
+    scene.display.shading.curvature_ridge_factor = 1.5
+    scene.display.shading.curvature_valley_factor = 1.2
+
+    views = {
+        "iso": (1, -1, 0.8),
+        "front": (-1, 0, 0),
+        "back": (1, 0, 0),
+        "left": (0, -1, 0),
+        "right": (0, 1, 0),
+        "top": (0, 0, 1),
+    }
+    selected = requested_views or list(views)
+    unknown = sorted(set(selected) - set(views))
+    if unknown:
+        raise SystemExit(f"unknown views: {', '.join(unknown)}")
+    for name in selected:
+        direction = views[name]
+        render_view(camera, center, span, name, direction, output_dir, basename)
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+"""Combine aligned lid meshes into one slicer-friendly multipart 3MF."""
+
+from __future__ import annotations
+
+import argparse
+import copy
+import zipfile
+from pathlib import Path
+from xml.etree import ElementTree as ET
+
+
+CORE = "http://schemas.microsoft.com/3dmanufacturing/core/2015/02"
+ET.register_namespace("", CORE)
+
+CONTENT_TYPES_XML = b'''<?xml version="1.0" encoding="UTF-8"?>
+<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
+  <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
+  <Default Extension="model" ContentType="application/vnd.ms-package.3dmanufacturing-3dmodel+xml"/>
+</Types>
+'''
+
+RELATIONSHIPS_XML = b'''<?xml version="1.0" encoding="UTF-8"?>
+<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
+  <Relationship Target="/3D/3dmodel.model" Id="rel0" Type="http://schemas.microsoft.com/3dmanufacturing/2013/01/3dmodel"/>
+</Relationships>
+'''
+
+
+def load_mesh(path: Path) -> ET.Element:
+    with zipfile.ZipFile(path) as archive:
+        root = ET.fromstring(archive.read("3D/3dmodel.model"))
+    mesh = root.find(f".//{{{CORE}}}mesh")
+    if mesh is None:
+        raise ValueError(f"{path} does not contain a 3MF mesh")
+    return copy.deepcopy(mesh)
+
+
+def model_xml(base: Path, accent: Path, title: str) -> bytes:
+    root = ET.Element(
+        f"{{{CORE}}}model",
+        {
+            "unit": "millimeter",
+            "{http://www.w3.org/XML/1998/namespace}lang": "en-US",
+        },
+    )
+    ET.SubElement(root, f"{{{CORE}}}metadata", {"name": "Title"}).text = title
+    ET.SubElement(root, f"{{{CORE}}}metadata", {"name": "Generator"}).text = (
+        "feather-case-wizard"
+    )
+    resources = ET.SubElement(root, f"{{{CORE}}}resources")
+    materials = ET.SubElement(resources, f"{{{CORE}}}basematerials", {"id": "1"})
+    ET.SubElement(
+        materials, f"{{{CORE}}}base", {"name": "Lid base", "displaycolor": "#D1D5DB"}
+    )
+    ET.SubElement(
+        materials,
+        f"{{{CORE}}}base",
+        {"name": "Accent inlays", "displaycolor": "#F97316"},
+    )
+
+    for object_id, name, source in (
+        (2, "Lid base — Filament 1", base),
+        (3, "Accent inlays — Filament 2", accent),
+    ):
+        obj = ET.SubElement(
+            resources,
+            f"{{{CORE}}}object",
+            {
+                "id": str(object_id),
+                "name": name,
+                "type": "model",
+                "pid": "1",
+                "pindex": str(object_id - 2),
+            },
+        )
+        obj.append(load_mesh(source))
+
+    assembly = ET.SubElement(
+        resources, f"{{{CORE}}}object", {"id": "4", "name": title, "type": "model"}
+    )
+    components = ET.SubElement(assembly, f"{{{CORE}}}components")
+    ET.SubElement(components, f"{{{CORE}}}component", {"objectid": "2"})
+    ET.SubElement(components, f"{{{CORE}}}component", {"objectid": "3"})
+    build = ET.SubElement(root, f"{{{CORE}}}build")
+    ET.SubElement(build, f"{{{CORE}}}item", {"objectid": "4"})
+    return ET.tostring(root, encoding="utf-8", xml_declaration=True)
+
+
+def bambu_model_settings_xml(title: str) -> bytes:
+    root = ET.Element("config")
+    obj = ET.SubElement(root, "object", {"id": "4"})
+    ET.SubElement(obj, "metadata", {"key": "name", "value": title})
+    for part_id, name, extruder in (
+        (2, "Lid base — Filament 1", 1),
+        (3, "Accent inlays — Filament 2", 2),
+    ):
+        part = ET.SubElement(obj, "part", {"id": str(part_id), "subtype": "normal_part"})
+        ET.SubElement(part, "metadata", {"key": "name", "value": name})
+        ET.SubElement(part, "metadata", {"key": "extruder", "value": str(extruder)})
+    ET.SubElement(root, "assemble")
+    return ET.tostring(root, encoding="utf-8", xml_declaration=True)
+
+
+def write_entry(archive: zipfile.ZipFile, name: str, data: bytes) -> None:
+    info = zipfile.ZipInfo(name)
+    info.create_system = 3
+    info.external_attr = 0o100644 << 16
+    info.compress_type = zipfile.ZIP_DEFLATED
+    archive.writestr(info, data)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("base", type=Path)
+    parser.add_argument("accent", type=Path)
+    parser.add_argument("output", type=Path)
+    parser.add_argument("--title", required=True)
+    args = parser.parse_args()
+
+    args.output.parent.mkdir(parents=True, exist_ok=True)
+    with zipfile.ZipFile(args.output, "w", zipfile.ZIP_DEFLATED) as archive:
+        write_entry(archive, "[Content_Types].xml", CONTENT_TYPES_XML)
+        write_entry(archive, "_rels/.rels", RELATIONSHIPS_XML)
+        write_entry(
+            archive,
+            "3D/3dmodel.model",
+            model_xml(args.base, args.accent, args.title),
+        )
+        write_entry(
+            archive,
+            "Metadata/model_settings.config",
+            bambu_model_settings_xml(args.title),
+        )
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,25 @@
+# Attitude w/battery
+
+Generated by the Feather Case Wizard.
+
+- Top profile: `generic`
+- FeatherWings: 1
+- Battery compartment: yes
+- 1/4-20 insert: yes
+- Approximate exterior: 88.6 × 59.1 × 33.2 mm
+- Formats: 3mf
+- Parts: `body`, `lid`
+- Custom cutouts: 0
+
+Run `ruby build.rb` in this directory to regenerate exports and previews.
+OpenSCAD, Blender, and Python 3 must be installed. Set `OPENSCAD`,
+`BLENDER`, or `PYTHON` to override their executable paths.
+
+To open the saved Customizer values manually:
+
+```bash
+openscad -p parameters.json -P attitude-w-battery source/feather_case.scad
+```
+
+The 3MF files contain portable geometry only. Choose printer, filament,
+plate, and slicing settings in Bambu Studio.
@@ -0,0 +1,148 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "fileutils"
+require "json"
+require "open3"
+require "pathname"
+require "tmpdir"
+require "yaml"
+
+ROOT = Pathname(__dir__).expand_path
+
+def executable(env_name, command)
+  override = ENV[env_name]
+  return File.expand_path(override) if override && File.executable?(override)
+
+  ENV.fetch("PATH", "").split(File::PATH_SEPARATOR).each do |directory|
+    candidate = File.join(directory, command)
+    return candidate if File.file?(candidate) && File.executable?(candidate)
+  end
+  nil
+end
+
+def literal(value)
+  case value
+  when String then JSON.generate(value)
+  when TrueClass then "true"
+  when FalseClass then "false"
+  when Numeric then value.to_s
+  when Array then "[#{value.map { |item| literal(item) }.join(",")}]"
+  else raise "Cannot convert #{value.inspect} to OpenSCAD"
+  end
+end
+
+def run!(*command, env: {})
+  stdout, stderr, status = Open3.capture3(env, *command)
+  return if status.success?
+
+  warn [stdout, stderr].reject(&:empty?).join("\n")
+  raise "Command failed (#{status.exitstatus}): #{command.first}"
+end
+
+config = YAML.safe_load_file(ROOT.join("case.yml"), permitted_classes: [],
+                             permitted_symbols: [], aliases: false)
+openscad = executable("OPENSCAD", "openscad")
+blender = executable("BLENDER", "blender")
+python = executable("PYTHON", "python3")
+abort "OpenSCAD not found; install it or set OPENSCAD" unless openscad
+abort "Blender not found; install it or set BLENDER" unless blender
+
+parameters = config.fetch("parameters").merge(
+  "extra_cutouts" => config.fetch("resolved").fetch("extra_cutouts")
+)
+artwork = !parameters.fetch("lid_label", "").empty? ||
+          parameters.fetch("lid_logo_enabled", false)
+abort "Python 3 not found; install it or set PYTHON" if artwork && !python
+parts = %w[body lid] + config.fetch("outputs").fetch("coupons")
+parts.concat(%w[lid_base lid_accent]) if artwork
+buttons = %w[button_a button_b button_c button_reset]
+if parameters["top_profile"] == "oled128x64" &&
+   buttons.any? { |name| parameters[name] }
+  parts << "buttons"
+end
+
+stage = Pathname(Dir.mktmpdir(".rebuild-", ROOT.to_s))
+begin
+  exports = stage.join("exports")
+  previews = stage.join("previews")
+  scratch = stage.join("meshes")
+  FileUtils.mkdir_p([exports, previews, scratch])
+  model = ROOT.join("source/feather_case.scad")
+  renderer = ROOT.join("source/render_stl_previews.py")
+
+  export = lambda do |output, part, overrides = {}|
+    values = parameters.merge(overrides).merge("part" => part)
+    command = [openscad, "-o", output.to_s]
+    values.each { |name, value| command.concat(["-D", "#{name}=#{literal(value)}"]) }
+    run!(*command, model.to_s)
+  end
+
+  config.fetch("outputs").fetch("formats").each do |format|
+    directory = exports.join(format)
+    FileUtils.mkdir_p(directory)
+    parts.each do |part|
+      puts "Exporting #{part}.#{format}…"
+      export.call(directory.join("#{part}.#{format}"), part)
+    end
+    if artwork && format == "3mf"
+      puts "Packaging lid_multicolor.3mf…"
+      run!(
+        python, ROOT.join("tools/package_multimaterial_3mf.py").to_s,
+        directory.join("lid_base.3mf").to_s,
+        directory.join("lid_accent.3mf").to_s,
+        directory.join("lid_multicolor.3mf").to_s,
+        "--title", "#{config.fetch("name")} Lid"
+      )
+    end
+  end
+
+  assembly = scratch.join("assembly.stl")
+  puts "Preparing assembly preview…"
+  export.call(assembly, "assembly",
+              "exploded_view" => config.fetch("outputs").fetch("assembly_exploded_view"),
+              "show_references" => false)
+  render_env = {"DISPLAY" => nil, "WAYLAND_DISPLAY" => nil}
+  run!(blender, "--background", "-noaudio", "--python", renderer.to_s, "--",
+       assembly.to_s, previews.to_s, "assembly", env: render_env)
+  parts.each do |part|
+    puts "Rendering #{part} preview…"
+    mesh = scratch.join("#{part}.stl")
+    export.call(mesh, part) unless mesh.file?
+    run!(blender, "--background", "-noaudio", "--python", renderer.to_s, "--",
+         mesh.to_s, previews.to_s, part, "iso", env: render_env)
+  end
+  if artwork
+    puts "Rendering multicolor lid preview…"
+    run!(
+      blender, "--background", "-noaudio", "--python",
+      ROOT.join("source/render_multicolor_lid.py").to_s, "--",
+      scratch.join("lid_base.stl").to_s,
+      scratch.join("lid_accent.stl").to_s,
+      previews.to_s, "lid_multicolor", parameters["lid_art_orientation"], env: render_env
+    )
+  end
+
+  backup = ROOT.join(".build-old-#{Process.pid}")
+  FileUtils.mkdir_p(backup)
+  %w[exports previews].each do |name|
+    current = ROOT.join(name)
+    FileUtils.mv(current, backup.join(name)) if current.exist?
+  end
+  begin
+    FileUtils.mv(exports, ROOT.join("exports"))
+    FileUtils.mv(previews, ROOT.join("previews"))
+    FileUtils.rm_rf(backup)
+  rescue StandardError
+    FileUtils.rm_rf(ROOT.join("exports"))
+    FileUtils.rm_rf(ROOT.join("previews"))
+    %w[exports previews].each do |name|
+      saved = backup.join(name)
+      FileUtils.mv(saved, ROOT.join(name)) if saved.exist?
+    end
+    raise
+  end
+  puts "Rebuilt #{ROOT}"
+ensure
+  FileUtils.rm_rf(stage)
+end
@@ -0,0 +1,94 @@
+---
+schema_version: 1
+name: Attitude w/battery
+slug: attitude-w-battery
+generator:
+  sha256: daeb9015a2bd04a16a75b77b32ee84bca2a9e2a4f4fe16605f3d5dc7e6d53036
+  created_with: feather-case-wizard
+parameters:
+  top_profile: generic
+  wing_count: 1
+  wing_pitch: 11.0
+  stack_height_override: 0.0
+  generic_component_height: 3.0
+  generic_top_gap: 2.0
+  gps_antenna_height: 4.0
+  gps_top_gap: 5.0
+  oled_component_height: 2.4
+  oled_face_gap: 0.8
+  button_a: true
+  button_b: true
+  button_c: true
+  button_reset: false
+  button_projection: 1.5
+  button_cap_size:
+  - 5.0
+  - 3.2
+  button_flange_size:
+  - 6.6
+  - 3.6
+  button_flange_thickness: 0.9
+  button_travel: 0.5
+  button_contact_extension: 0.7
+  battery_enabled: true
+  battery_length: 69.0
+  battery_diameter: 18.0
+  battery_radial_clearance: 0.6
+  battery_end_clearance: 1.0
+  battery_partition_thickness: 1.8
+  rocker_cutout_size:
+  - 12.9
+  - 19.4
+  rocker_corner_radius: 0.8
+  rocker_body_size:
+  - 15.0
+  - 21.0
+  - 21.0
+  rocker_artwork_gap: 2.0
+  tripod_insert_enabled: true
+  tripod_insert_length: 5.0
+  tripod_insert_hole_diameter: 7.2
+  tripod_insert_outer_diameter: 8.0
+  tripod_thread_clearance_diameter: 6.8
+  tripod_boss_diameter: 14.0
+  m25_insert_length: 4.0
+  m25_insert_hole_diameter: 3.1
+  m25_insert_outer_diameter: 3.5
+  m25_screw_clearance: 2.8
+  m25_boss_diameter: 7.0
+  insert_entry_chamfer: 0.6
+  insert_melt_relief: 0.8
+  wall_thickness: 2.4
+  floor_thickness: 2.4
+  lid_thickness: 3.2
+  corner_radius: 4.0
+  board_bottom_clearance: 5.4
+  board_side_clearance: 7.0
+  board_rear_clearance: 4.0
+  usb_board_wall_gap: 1.2
+  lid_lip_depth: 2.4
+  lid_lip_thickness: 1.2
+  fit_clearance: 0.35
+  hole_compensation: 0.2
+  lid_screw_head_diameter: 5.2
+  lid_screw_head_height: 2.5
+  lid_label: ''
+  lid_logo_enabled: false
+  lid_art_orientation: usb_left
+  lid_inlay_depth: 0.6
+  lid_inlay_fit_clearance: 0.08
+  lid_label_size: 5.0
+  lid_label_logo_gap: 2.0
+  lid_art_margin: 8.5
+  usb_opening_width: 12.5
+  usb_opening_height: 7.0
+  usb_opening_radius: 1.5
+  usb_vertical_offset: 0.0
+cutouts: []
+outputs:
+  formats:
+  - 3mf
+  coupons: []
+  assembly_exploded_view: 8
+resolved:
+  extra_cutouts: []
@@ -0,0 +1,76 @@
+{
+  "parameterSets": {
+    "attitude-w-battery": {
+      "top_profile": "\"generic\"",
+      "wing_count": "1",
+      "wing_pitch": "11.0",
+      "stack_height_override": "0.0",
+      "generic_component_height": "3.0",
+      "generic_top_gap": "2.0",
+      "gps_antenna_height": "4.0",
+      "gps_top_gap": "5.0",
+      "oled_component_height": "2.4",
+      "oled_face_gap": "0.8",
+      "button_a": "true",
+      "button_b": "true",
+      "button_c": "true",
+      "button_reset": "false",
+      "button_projection": "1.5",
+      "button_cap_size": "[5.0,3.2]",
+      "button_flange_size": "[6.6,3.6]",
+      "button_flange_thickness": "0.9",
+      "button_travel": "0.5",
+      "button_contact_extension": "0.7",
+      "battery_enabled": "true",
+      "battery_length": "69.0",
+      "battery_diameter": "18.0",
+      "battery_radial_clearance": "0.6",
+      "battery_end_clearance": "1.0",
+      "battery_partition_thickness": "1.8",
+      "rocker_cutout_size": "[12.9,19.4]",
+      "rocker_corner_radius": "0.8",
+      "rocker_body_size": "[15.0,21.0,21.0]",
+      "rocker_artwork_gap": "2.0",
+      "tripod_insert_enabled": "true",
+      "tripod_insert_length": "5.0",
+      "tripod_insert_hole_diameter": "7.2",
+      "tripod_insert_outer_diameter": "8.0",
+      "tripod_thread_clearance_diameter": "6.8",
+      "tripod_boss_diameter": "14.0",
+      "m25_insert_length": "4.0",
+      "m25_insert_hole_diameter": "3.1",
+      "m25_insert_outer_diameter": "3.5",
+      "m25_screw_clearance": "2.8",
+      "m25_boss_diameter": "7.0",
+      "insert_entry_chamfer": "0.6",
+      "insert_melt_relief": "0.8",
+      "wall_thickness": "2.4",
+      "floor_thickness": "2.4",
+      "lid_thickness": "3.2",
+      "corner_radius": "4.0",
+      "board_bottom_clearance": "5.4",
+      "board_side_clearance": "7.0",
+      "board_rear_clearance": "4.0",
+      "usb_board_wall_gap": "1.2",
+      "lid_lip_depth": "2.4",
+      "lid_lip_thickness": "1.2",
+      "fit_clearance": "0.35",
+      "hole_compensation": "0.2",
+      "lid_screw_head_diameter": "5.2",
+      "lid_screw_head_height": "2.5",
+      "lid_label": "\"\"",
+      "lid_logo_enabled": "false",
+      "lid_art_orientation": "\"usb_left\"",
+      "lid_inlay_depth": "0.6",
+      "lid_inlay_fit_clearance": "0.08",
+      "lid_label_size": "5.0",
+      "lid_label_logo_gap": "2.0",
+      "lid_art_margin": "8.5",
+      "usb_opening_width": "12.5",
+      "usb_opening_height": "7.0",
+      "usb_opening_radius": "1.5",
+      "usb_vertical_offset": "0.0"
+    }
+  },
+  "fileFormatVersion": "1"
+}
@@ -0,0 +1,82 @@
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+           d="m 134.23594,367.14576 v 34.66667 h 69.06667 c 37.86666,0 71.06666,-0.4 73.86666,-0.8 4.4,-0.8 7.2,-3.73333 31.33333,-32.8 14.53334,-17.46667 26.53334,-32.4 26.8,-32.93333 0.26667,-0.66667 -0.93333,-1.46667 -2.66666,-2 -1.73334,-0.4 -47.06667,-0.8 -100.66667,-0.8 h -97.73333 z"
+           id="path251"
+           style="fill:#000000;stroke:none;stroke-width:0.133333" />
+        <path
+           d="m 134.90261,432.74576 c -0.4,0.93334 -0.53333,27.2 -0.4,58.4 l 0.4,56.53333 38.4,-37.06666 38.26666,-37.06667 -0.26666,-20.93333 -0.4,-20.8 -37.73334,-0.4 c -29.46666,-0.26667 -37.86666,0 -38.26666,1.33333 z"
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@@ -0,0 +1,101 @@
+"""Render aligned lid-base and accent STLs with distinct materials."""
+
+import os
+import sys
+import math
+
+import bpy
+from mathutils import Matrix, Vector
+
+
+def import_mesh(path, name, color):
+    bpy.ops.wm.stl_import(filepath=os.path.abspath(path))
+    model = bpy.context.selected_objects[0]
+    model.name = name
+    material = bpy.data.materials.new(f"{name} material")
+    material.diffuse_color = color
+    material.metallic = 0.0
+    material.roughness = 0.45
+    model.data.materials.append(material)
+    return model
+
+
+def look_at(camera, target):
+    direction = Vector(target) - camera.location
+    camera.rotation_euler = direction.to_track_quat("-Z", "Y").to_euler()
+
+
+def main():
+    args = sys.argv[sys.argv.index("--") + 1 :]
+    if len(args) not in (4, 5):
+        raise SystemExit(
+            "expected: lid-base.stl lid-accent.stl output-directory basename [orientation]"
+        )
+    base_path, accent_path, output_dir, basename = args[:4]
+    orientation = args[4] if len(args) == 5 else "usb_left"
+    angles = {"usb_left": 0, "usb_front": 90, "usb_right": 180, "usb_rear": 270}
+    if orientation not in angles:
+        raise SystemExit(f"unknown lid orientation: {orientation}")
+    os.makedirs(output_dir, exist_ok=True)
+    bpy.ops.wm.read_factory_settings(use_empty=True)
+    models = [
+        import_mesh(base_path, "Lid base", (0.16, 0.42, 0.72, 1.0)),
+        import_mesh(accent_path, "Accent inlays", (0.95, 0.42, 0.08, 1.0)),
+    ]
+    # Lid exports are print-oriented with the decorated exterior face down.
+    # Turn both aligned parts over and present the configured USB edge in its
+    # named position so previews inspect the finished face as the user will.
+    for model in models:
+        model.matrix_world = (
+            Matrix.Rotation(math.radians(angles[orientation]), 4, "Z")
+            @ Matrix.Rotation(math.pi, 4, "X")
+        )
+    bpy.context.view_layer.update()
+
+    corners = [obj.matrix_world @ Vector(corner) for obj in models for corner in obj.bound_box]
+    mins = Vector([min(v[i] for v in corners) for i in range(3)])
+    maxs = Vector([max(v[i] for v in corners) for i in range(3)])
+    center = (mins + maxs) / 2
+    span = max(maxs - mins)
+
+    world = bpy.data.worlds.new("Inspection world")
+    world.use_nodes = True
+    world.node_tree.nodes["Background"].inputs["Color"].default_value = (0.035, 0.04, 0.05, 1)
+    world.node_tree.nodes["Background"].inputs["Strength"].default_value = 0.5
+    bpy.context.scene.world = world
+
+    camera_data = bpy.data.cameras.new("Camera")
+    camera = bpy.data.objects.new("Camera", camera_data)
+    bpy.context.collection.objects.link(camera)
+    bpy.context.scene.camera = camera
+    camera.data.type = "ORTHO"
+    camera.data.ortho_scale = span * 1.35
+
+    key_data = bpy.data.lights.new("Key", type="AREA")
+    key_data.energy = 900
+    key_data.size = span
+    key = bpy.data.objects.new("Key", key_data)
+    key.location = center + Vector((span, -span, span * 1.5))
+    bpy.context.collection.objects.link(key)
+
+    scene = bpy.context.scene
+    scene.render.engine = "BLENDER_WORKBENCH"
+    scene.render.resolution_x = 800
+    scene.render.resolution_y = 600
+    scene.render.resolution_percentage = 100
+    scene.render.image_settings.file_format = "PNG"
+    scene.display.shading.light = "STUDIO"
+    scene.display.shading.color_type = "MATERIAL"
+    scene.display.shading.show_shadows = True
+    scene.display.shading.show_cavity = True
+    scene.display.shading.cavity_type = "BOTH"
+
+    for view, direction in {"iso": (1, -1, 0.8), "top": (0, 0, 1)}.items():
+        camera.location = center + Vector(direction).normalized() * span * 2.2
+        look_at(camera, center)
+        scene.render.filepath = os.path.join(output_dir, f"{basename}_{view}.png")
+        bpy.ops.render.render(write_still=True)
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,127 @@
+"""Render six inspection views of an STL using Blender.
+
+Usage:
+    blender --background --python tools/render_stl_previews.py -- \
+        input.stl output-directory basename [comma-separated-views]
+"""
+
+import os
+import sys
+
+import bpy
+from mathutils import Vector
+
+
+def arguments():
+    args = sys.argv[sys.argv.index("--") + 1 :]
+    if len(args) not in (3, 4):
+        raise SystemExit(
+            "expected: input.stl output-directory basename [comma-separated-views]"
+        )
+    requested_views = args[3].split(",") if len(args) == 4 else None
+    return args[0], args[1], args[2], requested_views
+
+
+def look_at(camera, target):
+    direction = Vector(target) - camera.location
+    camera.rotation_euler = direction.to_track_quat("-Z", "Y").to_euler()
+
+
+def render_view(camera, center, span, name, direction, output_dir, basename):
+    distance = span * 2.2
+    camera.location = Vector(center) + Vector(direction).normalized() * distance
+    look_at(camera, center)
+    camera.data.type = "ORTHO"
+    camera.data.ortho_scale = span * 1.35
+    bpy.context.scene.render.filepath = os.path.join(
+        output_dir, f"{basename}_{name}.png"
+    )
+    bpy.ops.render.render(write_still=True)
+
+
+def main():
+    input_path, output_dir, basename, requested_views = arguments()
+    os.makedirs(output_dir, exist_ok=True)
+
+    bpy.ops.wm.read_factory_settings(use_empty=True)
+    bpy.ops.wm.stl_import(filepath=os.path.abspath(input_path))
+    model = bpy.context.selected_objects[0]
+    model.name = "Feather case"
+
+    material = bpy.data.materials.new("Case material")
+    material.diffuse_color = (0.16, 0.42, 0.72, 1.0)
+    material.metallic = 0.0
+    material.roughness = 0.45
+    model.data.materials.append(material)
+
+    corners = [model.matrix_world @ Vector(corner) for corner in model.bound_box]
+    mins = Vector([min(v[i] for v in corners) for i in range(3)])
+    maxs = Vector([max(v[i] for v in corners) for i in range(3)])
+    center = (mins + maxs) / 2
+    span = max(maxs - mins)
+
+    world = bpy.data.worlds.new("Inspection world")
+    world.use_nodes = True
+    world.node_tree.nodes["Background"].inputs["Color"].default_value = (
+        0.035,
+        0.04,
+        0.05,
+        1,
+    )
+    world.node_tree.nodes["Background"].inputs["Strength"].default_value = 0.5
+    bpy.context.scene.world = world
+
+    camera_data = bpy.data.cameras.new("Camera")
+    camera = bpy.data.objects.new("Camera", camera_data)
+    bpy.context.collection.objects.link(camera)
+    bpy.context.scene.camera = camera
+
+    key_data = bpy.data.lights.new("Key", type="AREA")
+    key_data.energy = 900
+    key_data.shape = "DISK"
+    key_data.size = span
+    key = bpy.data.objects.new("Key", key_data)
+    key.location = center + Vector((span, -span, span * 1.5))
+    bpy.context.collection.objects.link(key)
+
+    fill_data = bpy.data.lights.new("Fill", type="AREA")
+    fill_data.energy = 500
+    fill_data.size = span
+    fill = bpy.data.objects.new("Fill", fill_data)
+    fill.location = center + Vector((-span, span, span))
+    bpy.context.collection.objects.link(fill)
+
+    scene = bpy.context.scene
+    scene.render.engine = "BLENDER_WORKBENCH"
+    scene.render.resolution_x = 800
+    scene.render.resolution_y = 600
+    scene.render.resolution_percentage = 100
+    scene.render.image_settings.file_format = "PNG"
+    scene.render.film_transparent = False
+    scene.display.shading.light = "STUDIO"
+    scene.display.shading.color_type = "MATERIAL"
+    scene.display.shading.show_shadows = True
+    scene.display.shading.show_cavity = True
+    scene.display.shading.cavity_type = "BOTH"
+    scene.display.shading.curvature_ridge_factor = 1.5
+    scene.display.shading.curvature_valley_factor = 1.2
+
+    views = {
+        "iso": (1, -1, 0.8),
+        "front": (-1, 0, 0),
+        "back": (1, 0, 0),
+        "left": (0, -1, 0),
+        "right": (0, 1, 0),
+        "top": (0, 0, 1),
+    }
+    selected = requested_views or list(views)
+    unknown = sorted(set(selected) - set(views))
+    if unknown:
+        raise SystemExit(f"unknown views: {', '.join(unknown)}")
+    for name in selected:
+        direction = views[name]
+        render_view(camera, center, span, name, direction, output_dir, basename)
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+"""Combine aligned lid meshes into one slicer-friendly multipart 3MF."""
+
+from __future__ import annotations
+
+import argparse
+import copy
+import zipfile
+from pathlib import Path
+from xml.etree import ElementTree as ET
+
+
+CORE = "http://schemas.microsoft.com/3dmanufacturing/core/2015/02"
+ET.register_namespace("", CORE)
+
+CONTENT_TYPES_XML = b'''<?xml version="1.0" encoding="UTF-8"?>
+<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
+  <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
+  <Default Extension="model" ContentType="application/vnd.ms-package.3dmanufacturing-3dmodel+xml"/>
+</Types>
+'''
+
+RELATIONSHIPS_XML = b'''<?xml version="1.0" encoding="UTF-8"?>
+<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
+  <Relationship Target="/3D/3dmodel.model" Id="rel0" Type="http://schemas.microsoft.com/3dmanufacturing/2013/01/3dmodel"/>
+</Relationships>
+'''
+
+
+def load_mesh(path: Path) -> ET.Element:
+    with zipfile.ZipFile(path) as archive:
+        root = ET.fromstring(archive.read("3D/3dmodel.model"))
+    mesh = root.find(f".//{{{CORE}}}mesh")
+    if mesh is None:
+        raise ValueError(f"{path} does not contain a 3MF mesh")
+    return copy.deepcopy(mesh)
+
+
+def model_xml(base: Path, accent: Path, title: str) -> bytes:
+    root = ET.Element(
+        f"{{{CORE}}}model",
+        {
+            "unit": "millimeter",
+            "{http://www.w3.org/XML/1998/namespace}lang": "en-US",
+        },
+    )
+    ET.SubElement(root, f"{{{CORE}}}metadata", {"name": "Title"}).text = title
+    ET.SubElement(root, f"{{{CORE}}}metadata", {"name": "Generator"}).text = (
+        "feather-case-wizard"
+    )
+    resources = ET.SubElement(root, f"{{{CORE}}}resources")
+    materials = ET.SubElement(resources, f"{{{CORE}}}basematerials", {"id": "1"})
+    ET.SubElement(
+        materials, f"{{{CORE}}}base", {"name": "Lid base", "displaycolor": "#D1D5DB"}
+    )
+    ET.SubElement(
+        materials,
+        f"{{{CORE}}}base",
+        {"name": "Accent inlays", "displaycolor": "#F97316"},
+    )
+
+    for object_id, name, source in (
+        (2, "Lid base — Filament 1", base),
+        (3, "Accent inlays — Filament 2", accent),
+    ):
+        obj = ET.SubElement(
+            resources,
+            f"{{{CORE}}}object",
+            {
+                "id": str(object_id),
+                "name": name,
+                "type": "model",
+                "pid": "1",
+                "pindex": str(object_id - 2),
+            },
+        )
+        obj.append(load_mesh(source))
+
+    assembly = ET.SubElement(
+        resources, f"{{{CORE}}}object", {"id": "4", "name": title, "type": "model"}
+    )
+    components = ET.SubElement(assembly, f"{{{CORE}}}components")
+    ET.SubElement(components, f"{{{CORE}}}component", {"objectid": "2"})
+    ET.SubElement(components, f"{{{CORE}}}component", {"objectid": "3"})
+    build = ET.SubElement(root, f"{{{CORE}}}build")
+    ET.SubElement(build, f"{{{CORE}}}item", {"objectid": "4"})
+    return ET.tostring(root, encoding="utf-8", xml_declaration=True)
+
+
+def bambu_model_settings_xml(title: str) -> bytes:
+    root = ET.Element("config")
+    obj = ET.SubElement(root, "object", {"id": "4"})
+    ET.SubElement(obj, "metadata", {"key": "name", "value": title})
+    for part_id, name, extruder in (
+        (2, "Lid base — Filament 1", 1),
+        (3, "Accent inlays — Filament 2", 2),
+    ):
+        part = ET.SubElement(obj, "part", {"id": str(part_id), "subtype": "normal_part"})
+        ET.SubElement(part, "metadata", {"key": "name", "value": name})
+        ET.SubElement(part, "metadata", {"key": "extruder", "value": str(extruder)})
+    ET.SubElement(root, "assemble")
+    return ET.tostring(root, encoding="utf-8", xml_declaration=True)
+
+
+def write_entry(archive: zipfile.ZipFile, name: str, data: bytes) -> None:
+    info = zipfile.ZipInfo(name)
+    info.create_system = 3
+    info.external_attr = 0o100644 << 16
+    info.compress_type = zipfile.ZIP_DEFLATED
+    archive.writestr(info, data)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("base", type=Path)
+    parser.add_argument("accent", type=Path)
+    parser.add_argument("output", type=Path)
+    parser.add_argument("--title", required=True)
+    args = parser.parse_args()
+
+    args.output.parent.mkdir(parents=True, exist_ok=True)
+    with zipfile.ZipFile(args.output, "w", zipfile.ZIP_DEFLATED) as archive:
+        write_entry(archive, "[Content_Types].xml", CONTENT_TYPES_XML)
+        write_entry(archive, "_rels/.rels", RELATIONSHIPS_XML)
+        write_entry(
+            archive,
+            "3D/3dmodel.model",
+            model_xml(args.base, args.accent, args.title),
+        )
+        write_entry(
+            archive,
+            "Metadata/model_settings.config",
+            bambu_model_settings_xml(args.title),
+        )
+
+
+if __name__ == "__main__":
+    main()
@@ -6,14 +6,14 @@ Generated by the Feather Case Wizard.
 - FeatherWings: 1
 - Battery compartment: yes
 - 1/4-20 insert: yes
- Approximate exterior: 93.9 × 57.3 × 41.8 mm
+- Approximate exterior: 88.6 × 59.1 × 40.4 mm
 - Formats: 3mf
- Parts: `body`, `lid`, `insert_coupon`, `switch_coupon`, `fit_coupon`
+- Parts: `body`, `lid`, `lid_base`, `lid_accent`, `insert_coupon`, `switch_coupon`, `fit_coupon`
 - Custom cutouts: 0

 Run `ruby build.rb` in this directory to regenerate exports and previews.
-OpenSCAD and Blender must be installed. Set `OPENSCAD` or `BLENDER` to
-override their executable paths.
+OpenSCAD, Blender, and Python 3 must be installed. Set `OPENSCAD`,
+`BLENDER`, or `PYTHON` to override their executable paths.

 To open the saved Customizer values manually:

@@ -23,3 +23,9 @@ openscad -p parameters.json -P gps source/feather_case.scad

 The 3MF files contain portable geometry only. Choose printer, filament,
 plate, and slicing settings in Bambu Studio.
+
+For a two-color lid, open `exports/3mf/lid_multicolor.3mf` as one
+multipart object. Assign “Lid base — Filament 1” and “Accent inlays —
+Filament 2” to the desired filaments. `lid.3mf` is the complete
+single-color fallback; `lid_base.3mf` and `lid_accent.3mf` are also
+provided separately.
@@ -44,13 +44,18 @@ config = YAML.safe_load_file(ROOT.join("case.yml"), permitted_classes: [],
                             permitted_symbols: [], aliases: false)
 openscad = executable("OPENSCAD", "openscad")
 blender = executable("BLENDER", "blender")
+python = executable("PYTHON", "python3")
 abort "OpenSCAD not found; install it or set OPENSCAD" unless openscad
 abort "Blender not found; install it or set BLENDER" unless blender

 parameters = config.fetch("parameters").merge(
  "extra_cutouts" => config.fetch("resolved").fetch("extra_cutouts")
 )
+artwork = !parameters.fetch("lid_label", "").empty? ||
+          parameters.fetch("lid_logo_enabled", false)
+abort "Python 3 not found; install it or set PYTHON" if artwork && !python
 parts = %w[body lid] + config.fetch("outputs").fetch("coupons")
+parts.concat(%w[lid_base lid_accent]) if artwork
 buttons = %w[button_a button_b button_c button_reset]
 if parameters["top_profile"] == "oled128x64" &&
   buttons.any? { |name| parameters[name] }
@@ -80,6 +85,16 @@ begin
      puts "Exporting #{part}.#{format}…"
      export.call(directory.join("#{part}.#{format}"), part)
    end
+    if artwork && format == "3mf"
+      puts "Packaging lid_multicolor.3mf…"
+      run!(
+        python, ROOT.join("tools/package_multimaterial_3mf.py").to_s,
+        directory.join("lid_base.3mf").to_s,
+        directory.join("lid_accent.3mf").to_s,
+        directory.join("lid_multicolor.3mf").to_s,
+        "--title", "#{config.fetch("name")} Lid"
+      )
+    end
  end

  assembly = scratch.join("assembly.stl")
@@ -97,6 +112,16 @@ begin
    run!(blender, "--background", "-noaudio", "--python", renderer.to_s, "--",
         mesh.to_s, previews.to_s, part, "iso", env: render_env)
  end
+  if artwork
+    puts "Rendering multicolor lid preview…"
+    run!(
+      blender, "--background", "-noaudio", "--python",
+      ROOT.join("source/render_multicolor_lid.py").to_s, "--",
+      scratch.join("lid_base.stl").to_s,
+      scratch.join("lid_accent.stl").to_s,
+      previews.to_s, "lid_multicolor", parameters["lid_art_orientation"], env: render_env
+    )
+  end

  backup = ROOT.join(".build-old-#{Process.pid}")
  FileUtils.mkdir_p(backup)
@@ -3,7 +3,7 @@ schema_version: 1
 name: GPS
 slug: gps
 generator:
-  sha256: be611e3255e7d802719ebb0628e3d11481f8de05fc96c24d452f026d7b8e3353
+  sha256: 168dd3c04ca4015b07fe6c0295e7d4bb43969671f5f3552ffab31d8deffc3024
  created_with: feather-case-wizard
 parameters:
  top_profile: gps
@@ -36,20 +36,25 @@ parameters:
  battery_diameter: 18.0
  battery_radial_clearance: 0.6
  battery_end_clearance: 1.0
-  switch_hole_diameter: 12.0
-  switch_hole_compensation: 0.3
-  switch_cap_diameter: 8.0
-  switch_flange_diameter: 16.2
-  switch_body_length: 24.0
-  switch_body_diameter: 12.0
-  switch_wire_allowance: 3.0
+  battery_partition_thickness: 1.8
+  rocker_cutout_size:
+  - 12.9
+  - 19.4
+  rocker_corner_radius: 0.8
+  rocker_body_size:
+  - 15.0
+  - 21.0
+  - 21.0
+  rocker_artwork_gap: 2.0
  tripod_insert_enabled: true
-  tripod_insert_length: 6.4
-  tripod_insert_hole_diameter: 8.8
+  tripod_insert_length: 5.0
+  tripod_insert_hole_diameter: 7.2
+  tripod_insert_outer_diameter: 8.0
  tripod_thread_clearance_diameter: 6.8
  tripod_boss_diameter: 14.0
  m25_insert_length: 4.0
-  m25_insert_hole_diameter: 3.7
+  m25_insert_hole_diameter: 3.1
+  m25_insert_outer_diameter: 3.5
  m25_screw_clearance: 2.8
  m25_boss_diameter: 7.0
  insert_entry_chamfer: 0.6
@@ -61,13 +66,27 @@ parameters:
  board_bottom_clearance: 5.4
  board_side_clearance: 7.0
  board_rear_clearance: 4.0
-  usb_board_wall_gap: 1.2
+  usb_board_wall_gap: 2.0
  lid_lip_depth: 2.4
  lid_lip_thickness: 1.2
  fit_clearance: 0.35
+  cutout_min_web: 1.2
  hole_compensation: 0.2
  lid_screw_head_diameter: 5.2
  lid_screw_head_height: 2.5
+  usb_opening_enabled: true
+  usb_guide_enabled: true
+  usb_connector_overhang: 2.0
+  usb_guide_wall_thickness: 1.2
+  usb_guide_end_gap: 1.0
+  lid_label: GPS
+  lid_logo_enabled: true
+  lid_art_orientation: usb_left
+  lid_inlay_depth: 0.6
+  lid_inlay_fit_clearance: 0.08
+  lid_label_size: 5.0
+  lid_label_logo_gap: 2.0
+  lid_art_margin: 8.5
  usb_opening_width: 12.5
  usb_opening_height: 7.0
  usb_opening_radius: 1.5
@@ -27,20 +27,20 @@
      "battery_diameter": "18.0",
      "battery_radial_clearance": "0.6",
      "battery_end_clearance": "1.0",
-      "switch_hole_diameter": "12.0",
-      "switch_hole_compensation": "0.3",
-      "switch_cap_diameter": "8.0",
-      "switch_flange_diameter": "16.2",
-      "switch_body_length": "24.0",
-      "switch_body_diameter": "12.0",
-      "switch_wire_allowance": "3.0",
+      "battery_partition_thickness": "1.8",
+      "rocker_cutout_size": "[12.9,19.4]",
+      "rocker_corner_radius": "0.8",
+      "rocker_body_size": "[15.0,21.0,21.0]",
+      "rocker_artwork_gap": "2.0",
      "tripod_insert_enabled": "true",
-      "tripod_insert_length": "6.4",
-      "tripod_insert_hole_diameter": "8.8",
+      "tripod_insert_length": "5.0",
+      "tripod_insert_hole_diameter": "7.2",
+      "tripod_insert_outer_diameter": "8.0",
      "tripod_thread_clearance_diameter": "6.8",
      "tripod_boss_diameter": "14.0",
      "m25_insert_length": "4.0",
-      "m25_insert_hole_diameter": "3.7",
+      "m25_insert_hole_diameter": "3.1",
+      "m25_insert_outer_diameter": "3.5",
      "m25_screw_clearance": "2.8",
      "m25_boss_diameter": "7.0",
      "insert_entry_chamfer": "0.6",
@@ -52,13 +52,27 @@
      "board_bottom_clearance": "5.4",
      "board_side_clearance": "7.0",
      "board_rear_clearance": "4.0",
-      "usb_board_wall_gap": "1.2",
+      "usb_board_wall_gap": "2.0",
      "lid_lip_depth": "2.4",
      "lid_lip_thickness": "1.2",
      "fit_clearance": "0.35",
+      "cutout_min_web": "1.2",
      "hole_compensation": "0.2",
      "lid_screw_head_diameter": "5.2",
      "lid_screw_head_height": "2.5",
+      "usb_opening_enabled": "true",
+      "usb_guide_enabled": "true",
+      "usb_connector_overhang": "2.0",
+      "usb_guide_wall_thickness": "1.2",
+      "usb_guide_end_gap": "1.0",
+      "lid_label": "\"GPS\"",
+      "lid_logo_enabled": "true",
+      "lid_art_orientation": "\"usb_left\"",
+      "lid_inlay_depth": "0.6",
+      "lid_inlay_fit_clearance": "0.08",
+      "lid_label_size": "5.0",
+      "lid_label_logo_gap": "2.0",
+      "lid_art_margin": "8.5",
      "usb_opening_width": "12.5",
      "usb_opening_height": "7.0",
      "usb_opening_radius": "1.5",
@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="210mm"
+   height="297mm"
+   viewBox="0 0 210 297"
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+         transform="matrix(0.14274222,0,0,0.14274222,123.03997,38.158339)">
+        <path
+           d="m 134.23594,367.14576 v 34.66667 h 69.06667 c 37.86666,0 71.06666,-0.4 73.86666,-0.8 4.4,-0.8 7.2,-3.73333 31.33333,-32.8 14.53334,-17.46667 26.53334,-32.4 26.8,-32.93333 0.26667,-0.66667 -0.93333,-1.46667 -2.66666,-2 -1.73334,-0.4 -47.06667,-0.8 -100.66667,-0.8 h -97.73333 z"
+           id="path251"
+           style="fill:#000000;stroke:none;stroke-width:0.133333" />
+        <path
+           d="m 134.90261,432.74576 c -0.4,0.93334 -0.53333,27.2 -0.4,58.4 l 0.4,56.53333 38.4,-37.06666 38.26666,-37.06667 -0.26666,-20.93333 -0.4,-20.8 -37.73334,-0.4 c -29.46666,-0.26667 -37.86666,0 -38.26666,1.33333 z"
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+</svg>
@@ -12,7 +12,7 @@
 */

 /* [Output] */
-part = "assembly"; // [assembly,body,lid,buttons,insert_coupon,switch_coupon,fit_coupon]
+part = "assembly"; // [assembly,body,lid,lid_base,lid_accent,buttons,insert_coupon,switch_coupon,fit_coupon]
 exploded_view = 8; // [0:1:20]
 show_references = true;

@@ -47,24 +47,24 @@ battery_length = 69;
 battery_diameter = 18;
 battery_radial_clearance = 0.6;
 battery_end_clearance = 1;
-switch_hole_diameter = 12;
-switch_hole_compensation = 0.3;
-switch_cap_diameter = 8;
-switch_flange_diameter = 16.2;
-switch_body_length = 24;
-switch_body_diameter = 12;
-switch_wire_allowance = 3;
+battery_partition_thickness = 1.8;
+rocker_cutout_size = [12.9, 19.4];
+rocker_corner_radius = 0.8;
+rocker_body_size = [15, 21, 21];
+rocker_artwork_gap = 2;

 /* [Tripod mount] */
 tripod_insert_enabled = false;
-tripod_insert_length = 6.4;
-tripod_insert_hole_diameter = 8.8;
+tripod_insert_length = 5;
+tripod_insert_hole_diameter = 7.2;
+tripod_insert_outer_diameter = 8;
 tripod_thread_clearance_diameter = 6.8;
 tripod_boss_diameter = 14;

 /* [M2.5 inserts] */
 m25_insert_length = 4;
-m25_insert_hole_diameter = 3.7;
+m25_insert_hole_diameter = 3.1;
+m25_insert_outer_diameter = 3.5;
 m25_screw_clearance = 2.8;
 m25_boss_diameter = 7;
 insert_entry_chamfer = 0.6;
@@ -78,15 +78,32 @@ corner_radius = 4;
 board_bottom_clearance = 5.4;
 board_side_clearance = 7;
 board_rear_clearance = 4;
-usb_board_wall_gap = 1.2;
+usb_board_wall_gap = 2;
 lid_lip_depth = 2.4;
 lid_lip_thickness = 1.2;
 fit_clearance = 0.35;
+cutout_min_web = 1.2;
 hole_compensation = 0.2;
 lid_screw_head_diameter = 5.2;
 lid_screw_head_height = 2.5;

+/* [Two-color lid artwork] */
+lid_label = "";
+lid_logo_enabled = false;
+lid_art_orientation = "usb_left"; // [usb_left,usb_front,usb_right,usb_rear]
+lid_inlay_depth = 0.6; // [0.4:0.2:1]
+lid_inlay_fit_clearance = 0.08;
+lid_label_size = 5;
+lid_label_logo_gap = 2;
+lid_art_margin = 8.5;
+logo_file = "assets/NME-fixed.svg";
+
 /* [USB-C opening] */
+usb_opening_enabled = true;
+usb_guide_enabled = true;
+usb_connector_overhang = 2;
+usb_guide_wall_thickness = 1.2;
+usb_guide_end_gap = 1;
 usb_opening_width = 12.5;
 usb_opening_height = 7;
 usb_opening_radius = 1.5;
@@ -100,6 +117,8 @@ extra_cutouts = [];

 /* [Calibration] */
 coupon_steps = [-0.3, -0.15, 0, 0.15, 0.3];
+m25_coupon_steps = [-0.15, -0.075, 0, 0.075, 0.15];
+tripod_coupon_steps = [-0.3, -0.15, 0, 0.15, 0.3];

 $fn = $preview ? 36 : 72;
 eps = 0.02;
@@ -111,6 +130,9 @@ board_thickness = 1.6;
 mount_x = [2.54, 48.26];
 mount_y = [2.54, 20.32];
 usb_center_y = 11.43;
+jst_center_xy = [10.9855, 19.304];
+jst_body_size = [8, 7.5, 4.5];
+jst_relief_clearance = 0.5;

 // Official 128x64 OLED FeatherWing geometry in Feather-board coordinates.
 oled_visible_min = [11.42, 3.78];
@@ -127,11 +149,34 @@ effective_board_clearance = max(
    board_bottom_clearance,
    m25_insert_length + insert_melt_relief + 0.6
 );
+lid_boss_r = m25_boss_diameter / 2;
+lid_boss_wall_overlap = 0.6;
+front_lid_boss_center = wall_thickness + lid_boss_r
+    - lid_boss_wall_overlap;
+
+// Combined battery/tripod builds need room around the centered insert entry.
+combined_tripod_board_gutter = battery_enabled && tripod_insert_enabled ? 2.4 : 0;
+combined_tripod_x_shift = battery_enabled && tripod_insert_enabled ? 5 : 0;

 board_origin_x = wall_thickness + usb_board_wall_gap;
-board_origin_y = wall_thickness + board_side_clearance;
+board_origin_y = wall_thickness + board_side_clearance
+    + combined_tripod_board_gutter;
 board_bottom_z = effective_floor + effective_board_clearance;
 board_top_z = board_bottom_z + board_thickness;
+usb_center_u = board_origin_y + usb_center_y;
+usb_center_z = board_top_z + 1.6 + usb_vertical_offset;
+usb_inner_width = usb_opening_width + hole_compensation;
+usb_inner_height = usb_opening_height + hole_compensation;
+usb_guide_length = max(
+    0,
+    usb_board_wall_gap - usb_connector_overhang - usb_guide_end_gap
+);
+usb_guide_active = usb_opening_enabled && usb_guide_enabled
+    && usb_guide_length > 0;
+usb_reserved_width = usb_inner_width
+    + (usb_guide_active ? 2 * usb_guide_wall_thickness : 0);
+usb_reserved_height = usb_inner_height
+    + (usb_guide_active ? 2 * usb_guide_wall_thickness : 0);

 computed_top_pcb_z = board_top_z + wing_count * wing_pitch;
 top_pcb_z = stack_height_override > 0
@@ -147,19 +192,16 @@ profile_top_gap =
    generic_top_gap;

 partition_y = board_origin_y + feather_width + 1;
-battery_center_y = partition_y + wall_thickness + battery_radial_clearance
-    + battery_diameter / 2;
-battery_start_x = board_origin_x + battery_end_clearance;
+battery_center_y = partition_y + battery_partition_thickness
+    + battery_radial_clearance + battery_diameter / 2;
+battery_start_x = front_lid_boss_center + lid_boss_r
+    + battery_end_clearance;
 battery_end_x = battery_start_x + battery_length;
-switch_center_x = battery_end_x + max(
-    switch_body_diameter / 2 + 0.8,
-    switch_flange_diameter / 2 + 0.5
-);

 case_length_plain = board_origin_x + feather_length
    + board_rear_clearance + wall_thickness;
-case_length_battery = switch_center_x + switch_flange_diameter / 2
-    + 1.2 + wall_thickness;
+case_length_battery = battery_end_x + battery_end_clearance
+    + wall_thickness + m25_boss_diameter - lid_boss_wall_overlap;
 case_length = battery_enabled ? max(case_length_plain, case_length_battery)
    : case_length_plain;

@@ -170,23 +212,70 @@ case_width_battery = battery_center_y + battery_diameter / 2
 case_width = battery_enabled ? max(case_width_plain, case_width_battery)
    : case_width_plain;

+rocker_center_x = case_length - wall_thickness - fit_clearance
+    - lid_lip_thickness - fit_clearance - rocker_body_size[0] / 2;
+rocker_center_y = front_lid_boss_center + lid_boss_r + fit_clearance
+    + rocker_body_size[1] / 2;
+
+lid_artwork_enabled = lid_label != "" || lid_logo_enabled;
+lid_art_rotation =
+    lid_art_orientation == "usb_left" ? 0 :
+    lid_art_orientation == "usb_front" ? 90 :
+    lid_art_orientation == "usb_right" ? 180 : 270;
+lid_art_safe_max_x = battery_enabled
+    ? rocker_center_x - rocker_cutout_size[0] / 2 - rocker_artwork_gap
+    : case_length - lid_art_margin;
+lid_art_physical_size = [
+    lid_art_safe_max_x - lid_art_margin,
+    case_width - 2 * lid_art_margin
+];
+lid_art_center = [
+    lid_art_margin + lid_art_physical_size[0] / 2,
+    case_width / 2
+];
+lid_art_canvas_size = lid_art_rotation == 0 || lid_art_rotation == 180
+    ? lid_art_physical_size
+    : [lid_art_physical_size[1], lid_art_physical_size[0]];
+lid_art_available_size = lid_art_canvas_size;
+lid_label_height = lid_label == "" ? 0 : lid_label_size;
+lid_art_gap = lid_label != "" && lid_logo_enabled ? lid_label_logo_gap : 0;
+logo_native_size = [30, 25.75];
+logo_max_height = lid_art_available_size[1] - lid_label_height - lid_art_gap;
+logo_scale = lid_logo_enabled ? min(
+    lid_art_available_size[0] / logo_native_size[0],
+    logo_max_height / logo_native_size[1]
+) : 0;
+logo_size = [logo_native_size[0] * logo_scale,
+    logo_native_size[1] * logo_scale];
+lid_art_total_height = logo_size[1] + lid_art_gap + lid_label_height;
+lid_label_center_y = -lid_art_total_height / 2 + lid_label_height / 2;
+lid_logo_center_y = -lid_art_total_height / 2 + lid_label_height
+    + lid_art_gap + logo_size[1] / 2;
+
+tripod_center_x = case_length / 2 - combined_tripod_x_shift;
+tripod_center_y = case_width / 2;
+tripod_entry_radius = tripod_insert_outer_diameter / 2;
+tripod_standoff_clearance = min([
+    for (mx = mount_x, my = mount_y)
+        sqrt(
+            pow(board_origin_x + mx - tripod_center_x, 2)
+            + pow(board_origin_y + my - tripod_center_y, 2)
+        ) - tripod_entry_radius - m25_boss_diameter / 2
+]);
+tripod_partition_clearance = partition_y
+    - (tripod_center_y + tripod_entry_radius);
+
 battery_center_z = effective_floor + battery_radial_clearance
    + battery_diameter / 2;
-switch_center_z = max(
-    effective_floor + switch_flange_diameter / 2 + 1,
-    battery_center_z
-);
 electronics_ceiling_z = top_pcb_z + profile_component_height + profile_top_gap;
 battery_ceiling_z = battery_enabled
-    ? max(
-        battery_center_z + battery_diameter / 2 + battery_radial_clearance,
-        switch_center_z + switch_flange_diameter / 2 + 1
-    )
+    ? battery_center_z + battery_diameter / 2 + battery_radial_clearance
    : 0;
-body_height = max(electronics_ceiling_z, battery_ceiling_z);
+rocker_ceiling_z = battery_enabled
+    ? effective_floor + rocker_body_size[2] + fit_clearance
+    : 0;
+body_height = max(electronics_ceiling_z, battery_ceiling_z, rocker_ceiling_z);

-lid_boss_r = m25_boss_diameter / 2;
-lid_boss_wall_overlap = 0.6;
 lid_boss_xy = [
    [
        wall_thickness + lid_boss_r - lid_boss_wall_overlap,
@@ -210,14 +299,86 @@ assert(wing_count >= 1, "wing_count must be at least one");
 assert(top_profile == "generic" || top_profile == "gps"
    || top_profile == "oled128x64", "Unsupported top_profile");
 assert(wall_thickness >= 1.2, "wall_thickness is too small for 0.6 mm FDM");
+assert(battery_partition_thickness >= 1.2,
+    "battery_partition_thickness is too small for 0.6 mm FDM");
 assert(lid_lip_thickness >= 1.2, "lid lip needs at least two 0.6 mm lines");
+assert(lid_art_orientation == "usb_left"
+    || lid_art_orientation == "usb_front"
+    || lid_art_orientation == "usb_right"
+    || lid_art_orientation == "usb_rear",
+    "Unsupported lid_art_orientation");
+assert(!lid_artwork_enabled || top_profile != "oled128x64",
+    "Lid artwork is not supported with the OLED profile");
+assert(!lid_artwork_enabled || lid_inlay_depth < lid_thickness,
+    "Lid inlay must be shallower than the lid");
+assert(!lid_artwork_enabled
+    || (lid_art_available_size[0] > 0 && lid_art_available_size[1] > 0),
+    "Lid artwork margin leaves no printable area");
+assert(!lid_logo_enabled || logo_scale > 0,
+    "Lid logo has no printable area");
 assert(m25_boss_diameter > m25_insert_hole_diameter + 2,
    "M2.5 boss does not have enough radial material");
+assert(m25_insert_outer_diameter >= m25_insert_hole_diameter,
+    "M2.5 insert entry must not be smaller than its pilot");
 assert(!tripod_insert_enabled
    || tripod_boss_diameter > tripod_insert_hole_diameter + 3,
    "Tripod insert boss does not have enough radial material");
+assert(usb_opening_enabled || !usb_guide_enabled,
+    "USB guide requires the USB opening");
+assert(!tripod_insert_enabled
+    || tripod_insert_outer_diameter >= tripod_insert_hole_diameter,
+    "Tripod insert entry must not be smaller than its pilot");
+assert(!tripod_insert_enabled || tripod_standoff_clearance >= 1.2,
+    "Tripod insert entry is too close to a Feather standoff");
+assert(!battery_enabled || !tripod_insert_enabled
+    || tripod_partition_clearance >= 1,
+    "Tripod insert entry is too close to the battery partition");
+assert(!battery_enabled
+    || rocker_center_x - rocker_body_size[0] / 2
+        >= board_origin_x + feather_length + fit_clearance,
+    "Rocker body overlaps the Feather PCB");
+assert(!battery_enabled
+    || rocker_center_y + rocker_body_size[1] / 2
+        <= partition_y - fit_clearance,
+    "Rocker body overlaps the battery partition");
+assert(!battery_enabled
+    || body_height - rocker_body_size[2] >= effective_floor,
+    "Rocker body intersects the case floor");

 function clamp(v, lo, hi) = min(max(v, lo), hi);
+function cutout_height(entry) = len(entry) > 5 ? entry[5] : entry[4];
+function cutouts_separated(first, second, web) =
+    abs(first[2] - second[2])
+        >= (first[4] + second[4]) / 2 + web
+    || abs(first[3] - second[3])
+        >= (cutout_height(first) + cutout_height(second)) / 2 + web;
+function cutout_clear_of_usb(entry, web) =
+    abs(entry[2] - usb_center_u)
+        >= (entry[4] + usb_reserved_width) / 2 + web
+    || abs(entry[3] - usb_center_z)
+        >= (cutout_height(entry) + usb_reserved_height) / 2 + web;
+
+module validate_cutout_spacing() {
+    if (len(extra_cutouts) > 1)
+        for (first = [0 : len(extra_cutouts) - 2],
+             second = [first + 1 : len(extra_cutouts) - 1])
+            if (extra_cutouts[first][0] == extra_cutouts[second][0])
+                assert(
+                    cutouts_separated(
+                        extra_cutouts[first],
+                        extra_cutouts[second],
+                        cutout_min_web
+                    ),
+                    "Custom cutouts are too close on the same wall"
+                );
+    if (usb_opening_enabled)
+        for (entry = extra_cutouts)
+            if (entry[0] == "front")
+                assert(
+                    cutout_clear_of_usb(entry, cutout_min_web),
+                    "Front cutout is too close to the USB opening or guide"
+                );
+}

 module rounded_rect_2d(size, radius) {
    r = clamp(radius, 0.01, min(size[0], size[1]) / 2 - 0.01);
@@ -242,8 +403,8 @@ module rounded_box(size, radius) {
        rounded_rect_2d([size[0], size[1]], radius);
 }

-module insert_pocket(diameter, depth, entry_z, downward = true) {
-    bore_d = diameter + hole_compensation;
+module insert_pocket(diameter, entry_diameter, depth, entry_z, downward = true) {
+    bore_d = diameter;
    if (downward) {
        translate([0, 0, entry_z - depth])
            cylinder(h = depth + eps, d = bore_d);
@@ -251,7 +412,7 @@ module insert_pocket(diameter, depth, entry_z, downward = true) {
            cylinder(
                h = insert_entry_chamfer + eps,
                d1 = bore_d,
-                d2 = bore_d + 2 * insert_entry_chamfer
+                d2 = entry_diameter
            );
    } else {
        translate([0, 0, entry_z - eps])
@@ -259,7 +420,7 @@ module insert_pocket(diameter, depth, entry_z, downward = true) {
        translate([0, 0, entry_z - eps])
            cylinder(
                h = insert_entry_chamfer + eps,
-                d1 = bore_d + 2 * insert_entry_chamfer,
+                d1 = entry_diameter,
                d2 = bore_d
            );
    }
@@ -301,6 +462,40 @@ module face_circle_cutout(face, u, z, diameter) {
            rotate([-90, 0, 0]) cylinder(h = depth, d = diameter);
 }

+module x_rounded_prism(x, length, u, z, width, height, radius) {
+    r = clamp(radius, 0.01, min(width, height) / 2 - 0.01);
+    hull()
+        for (yy = [u - width / 2 + r, u + width / 2 - r],
+             zz = [z - height / 2 + r, z + height / 2 - r])
+            translate([x, yy, zz])
+                rotate([0, 90, 0]) cylinder(h = length, r = r);
+}
+
+module usb_guide_shell() {
+    outer_width = usb_inner_width + 2 * usb_guide_wall_thickness;
+    outer_height = usb_inner_height + 2 * usb_guide_wall_thickness;
+    difference() {
+        x_rounded_prism(
+            wall_thickness - eps,
+            usb_guide_length + 2 * eps,
+            usb_center_u,
+            usb_center_z,
+            outer_width,
+            outer_height,
+            usb_opening_radius + usb_guide_wall_thickness
+        );
+        x_rounded_prism(
+            wall_thickness - 2 * eps,
+            usb_guide_length + 4 * eps,
+            usb_center_u,
+            usb_center_z,
+            usb_inner_width,
+            usb_inner_height,
+            usb_opening_radius
+        );
+    }
+}
+
 module custom_wall_cutout(entry) {
    face = entry[0];
    shape = entry[1];
@@ -368,20 +563,27 @@ module battery_cradle() {
        battery_end_x - 4
    ];

-    // Board/battery partition, with a lead-routing notch near the JST end.
+    // One open-topped front passage provides JST plug access and enough room
+    // to route the battery lead beneath the Feather PCB beside the lid boss.
    difference() {
        translate([wall_thickness, partition_y, effective_floor - eps])
            cube([
                battery_end_x - wall_thickness + battery_end_clearance,
-                wall_thickness,
+                battery_partition_thickness,
                partition_height - effective_floor + eps
            ]);
        translate([
-            board_origin_x + 6.5,
+            wall_thickness - eps,
            partition_y - eps,
            effective_floor + 1.5
        ])
-            cube([9, wall_thickness + 2 * eps, 6]);
+            cube([
+                board_origin_x + jst_center_xy[0]
+                    + (jst_body_size[0] + 2 * jst_relief_clearance) / 2
+                    - wall_thickness + 2 * eps,
+                battery_partition_thickness + 2 * eps,
+                partition_height - effective_floor - 1.5 + eps
+            ]);
    }

    // Three low curved ribs cradle the protected cylindrical pack.
@@ -412,29 +614,16 @@ module battery_cradle() {
        battery_end_x + battery_end_clearance
    ])
        translate([
-            x,
+            x - eps,
            battery_center_y - battery_diameter / 2 - battery_radial_clearance,
            effective_floor - eps
        ])
            cube([
-                wall_thickness,
+                wall_thickness + 2 * eps,
                battery_diameter + 2 * battery_radial_clearance,
                battery_diameter / 2 + 1 + eps
            ]);

-    // Rear cross-strip separates the side-mounted switch body from the cell.
-    translate([
-        battery_end_x + battery_end_clearance,
-        partition_y,
-        effective_floor - eps
-    ])
-        cube([
-            case_length - wall_thickness - battery_end_x - battery_end_clearance,
-            case_width - wall_thickness - partition_y,
-            min(body_height - effective_floor, switch_center_z
-                + switch_body_diameter / 2 + switch_wire_allowance
-                - effective_floor) + eps
-        ]);
 }

 module body_positive() {
@@ -453,8 +642,10 @@ module body_positive() {
        if (battery_enabled)
            battery_cradle();
        if (tripod_insert_enabled)
-            translate([case_length / 2, case_width / 2, 0])
+            translate([tripod_center_x, tripod_center_y, 0])
                cylinder(h = effective_floor, d = tripod_boss_diameter);
+        if (usb_guide_active)
+            usb_guide_shell();
    }
 }

@@ -464,6 +655,7 @@ module body_cutouts() {
        translate([board_origin_x + mx, board_origin_y + my, 0])
            insert_pocket(
                m25_insert_hole_diameter,
+                m25_insert_outer_diameter,
                m25_insert_length + insert_melt_relief,
                board_bottom_z
            );
@@ -473,44 +665,24 @@ module body_cutouts() {
        translate([p[0], p[1], 0])
            insert_pocket(
                m25_insert_hole_diameter,
+                m25_insert_outer_diameter,
                m25_insert_length + insert_melt_relief,
                body_height
            );

    // USB-C cable opening. Connector center is from the official ESP32 V2 PCB.
-    usb_center_z = board_top_z + 1.6 + usb_vertical_offset;
-    face_rounded_cutout(
-        "front",
-        board_origin_y + usb_center_y,
-        usb_center_z,
-        usb_opening_width + hole_compensation,
-        usb_opening_height + hole_compensation,
-        usb_opening_radius
-    );
-
-    if (battery_enabled) {
-        face_circle_cutout(
-            "right",
-            switch_center_x,
-            switch_center_z,
-            switch_hole_diameter + switch_hole_compensation
+    if (usb_opening_enabled)
+        face_rounded_cutout(
+            "front",
+            usb_center_u,
+            usb_center_z,
+            usb_inner_width,
+            usb_inner_height,
+            usb_opening_radius
        );
-        // Clear the switch body and its prewired terminals through the rear bay.
-        translate([
-            switch_center_x,
-            case_width - wall_thickness + eps,
-            switch_center_z
-        ])
-            rotate([90, 0, 0])
-                cylinder(
-                    h = switch_body_length + switch_wire_allowance
-                        + wall_thickness + eps,
-                    d = switch_body_diameter + 2 * fit_clearance
-                );
-    }

    if (tripod_insert_enabled) {
-        translate([case_length / 2, case_width / 2, 0]) {
+        translate([tripod_center_x, tripod_center_y, 0]) {
            translate([0, 0, -eps])
                cylinder(
                    h = effective_floor + 2 * eps,
@@ -518,6 +690,7 @@ module body_cutouts() {
                );
            insert_pocket(
                tripod_insert_hole_diameter,
+                tripod_insert_outer_diameter,
                tripod_insert_length + insert_melt_relief,
                effective_floor
            );
@@ -611,6 +784,13 @@ module oled_button_lid_cutout(xy) {
 module lid_cutouts() {
    // Through holes plus shallow counterbores for flush M2.5 socket heads.
    for (p = lid_boss_xy) {
+        // Scallop only the locating lip so it can pass over the full-height
+        // insert boss while leaving the lid plate supported by the boss top.
+        translate([p[0], p[1], lid_thickness - eps])
+            cylinder(
+                h = lid_lip_depth + 2 * eps,
+                d = m25_boss_diameter + 2 * fit_clearance
+            );
        translate([p[0], p[1], -eps])
            cylinder(
                h = lid_thickness + lid_lip_depth + 2 * eps,
@@ -623,6 +803,14 @@ module lid_cutouts() {
            );
    }

+    if (battery_enabled)
+        translate([rocker_center_x, rocker_center_y, -eps])
+            centered_rounded_prism(
+                rocker_cutout_size,
+                lid_thickness + lid_lip_depth + 2 * eps,
+                rocker_corner_radius
+            );
+
    if (top_profile == "oled128x64") {
        beveled_oled_window();
        if (button_a) oled_button_lid_cutout(oled_button_a_xy);
@@ -632,13 +820,55 @@ module lid_cutouts() {
    }
 }

-module lid() {
+module lid_artwork_nominal_2d() {
+    translate(lid_art_center)
+        rotate(lid_art_rotation)
+            // The lid is modeled exterior-face-down; mirror the artwork so it
+            // reads normally after the lid is turned into service position.
+            mirror([0, 1, 0]) {
+                if (lid_logo_enabled)
+                    translate([0, lid_logo_center_y])
+                        resize(logo_size)
+                            import(logo_file, center = true);
+                if (lid_label != "")
+                    translate([0, lid_label_center_y])
+                        text(
+                            lid_label,
+                            size = lid_label_size,
+                            halign = "center",
+                            valign = "center",
+                            font = "DejaVu Sans:style=Bold"
+                        );
+            }
+}
+
+module lid_artwork_2d(inset = 0) {
+    offset(delta = inset)
+        lid_artwork_nominal_2d();
+}
+
+module lid_base() {
    difference() {
        lid_plate_positive();
        lid_cutouts();
+        if (lid_artwork_enabled)
+            translate([0, 0, -eps])
+                linear_extrude(height = lid_inlay_depth + eps)
+                    lid_artwork_2d(lid_inlay_fit_clearance);
    }
 }

+module lid_accent() {
+    if (lid_artwork_enabled)
+        linear_extrude(height = lid_inlay_depth)
+            lid_artwork_2d();
+}
+
+module lid() {
+    color([0.92, 0.92, 0.95]) lid_base();
+    color([0.95, 0.42, 0.08]) lid_accent();
+}
+
 module one_oled_button() {
    recess_depth = button_flange_thickness + button_travel;
    stem_height = lid_thickness - recess_depth + button_projection;
@@ -678,6 +908,13 @@ module reference_board() {
    color([0.05, 0.25, 0.55, 0.75])
        translate([board_origin_x, board_origin_y, board_bottom_z])
            rounded_box([feather_length, feather_width, board_thickness], 2.54);
+    color([0.92, 0.92, 0.86, 0.9])
+        translate([
+            board_origin_x + jst_center_xy[0] - jst_body_size[0] / 2,
+            board_origin_y + jst_center_xy[1] - 4.5,
+            board_top_z
+        ])
+            cube(jst_body_size);
    color([0.12, 0.45, 0.75, 0.45])
        for (i = [1 : wing_count])
            translate([
@@ -744,19 +981,20 @@ module reference_battery_and_switch() {
            translate([battery_start_x, battery_center_y, battery_center_z])
                rotate([0, 90, 0])
                    cylinder(h = battery_length, d = battery_diameter);
-        color([0.8, 0.15, 0.1, 0.65])
+        color([0.08, 0.08, 0.08, 0.85])
            translate([
-                switch_center_x,
-                case_width - wall_thickness,
-                switch_center_z
+                rocker_center_x - rocker_body_size[0] / 2,
+                rocker_center_y - rocker_body_size[1] / 2,
+                body_height + exploded_view - rocker_body_size[2]
            ])
-                rotate([90, 0, 0]) {
-                    cylinder(h = switch_body_length, d = switch_body_diameter);
-                    translate([0, 0, -1.5])
-                        cylinder(h = 1.5, d = switch_flange_diameter);
-                    translate([0, 0, -3])
-                        cylinder(h = 3, d = switch_cap_diameter);
-                }
+                cube(rocker_body_size);
+        color([0.12, 0.12, 0.12, 0.95])
+            translate([
+                rocker_center_x - rocker_cutout_size[0] / 2,
+                rocker_center_y - rocker_cutout_size[1] / 2,
+                body_height + exploded_view + lid_thickness
+            ])
+                cube([rocker_cutout_size[0], rocker_cutout_size[1], 2.5]);
    }
 }

@@ -774,13 +1012,9 @@ module assembly() {
                lid();
 }

-module coupon_hole(x, y, diameter, depth) {
-    translate([x, y, -eps]) cylinder(h = depth + 2 * eps, d = diameter);
-}
-
 module insert_coupon() {
    spacing = 15;
-    coupon_length = spacing * len(coupon_steps) + 8;
+    coupon_length = spacing * len(tripod_coupon_steps) + 8;
    coupon_width = 32;
    coupon_height = max(
        m25_insert_length + insert_melt_relief + 1.2,
@@ -788,18 +1022,22 @@ module insert_coupon() {
    );
    difference() {
        rounded_box([coupon_length, coupon_width, coupon_height], 3);
-        for (i = [0 : len(coupon_steps) - 1]) {
+        for (i = [0 : len(tripod_coupon_steps) - 1]) {
            x = 7 + i * spacing;
-            coupon_hole(
-                x, 8,
-                m25_insert_hole_diameter + coupon_steps[i],
-                m25_insert_length + insert_melt_relief
-            );
-            coupon_hole(
-                x, 23,
-                tripod_insert_hole_diameter + coupon_steps[i],
-                tripod_insert_length + insert_melt_relief
-            );
+            translate([x, 8, 0])
+                insert_pocket(
+                    m25_insert_hole_diameter + m25_coupon_steps[i],
+                    m25_insert_outer_diameter,
+                    m25_insert_length + insert_melt_relief,
+                    coupon_height
+                );
+            translate([x, 23, 0])
+                insert_pocket(
+                    tripod_insert_hole_diameter + tripod_coupon_steps[i],
+                    tripod_insert_outer_diameter,
+                    tripod_insert_length + insert_melt_relief,
+                    coupon_height
+                );
        }
    }
 }
@@ -807,15 +1045,17 @@ module insert_coupon() {
 module switch_coupon() {
    spacing = 18;
    coupon_length = spacing * len(coupon_steps) + 6;
-    coupon_width = 24;
-    coupon_height = wall_thickness;
+    coupon_width = rocker_cutout_size[1] + 6;
+    coupon_height = lid_thickness;
    difference() {
        rounded_box([coupon_length, coupon_width, coupon_height], 3);
        for (i = [0 : len(coupon_steps) - 1])
            translate([6 + i * spacing, coupon_width / 2, -eps])
-                cylinder(
-                    h = coupon_height + 2 * eps,
-                    d = switch_hole_diameter + coupon_steps[i]
+                centered_rounded_prism(
+                    rocker_cutout_size
+                        + [coupon_steps[i], coupon_steps[i]],
+                    coupon_height + 2 * eps,
+                    rocker_corner_radius
                );
    }
 }
@@ -854,12 +1094,18 @@ module fit_coupon() {
        }
 }

+validate_cutout_spacing();
+
 if (part == "assembly")
    assembly();
 else if (part == "body")
    body();
 else if (part == "lid")
    lid();
+else if (part == "lid_base")
+    lid_base();
+else if (part == "lid_accent")
+    lid_accent();
 else if (part == "buttons")
    buttons();
 else if (part == "insert_coupon")
@@ -0,0 +1,101 @@
+"""Render aligned lid-base and accent STLs with distinct materials."""
+
+import os
+import sys
+import math
+
+import bpy
+from mathutils import Matrix, Vector
+
+
+def import_mesh(path, name, color):
+    bpy.ops.wm.stl_import(filepath=os.path.abspath(path))
+    model = bpy.context.selected_objects[0]
+    model.name = name
+    material = bpy.data.materials.new(f"{name} material")
+    material.diffuse_color = color
+    material.metallic = 0.0
+    material.roughness = 0.45
+    model.data.materials.append(material)
+    return model
+
+
+def look_at(camera, target):
+    direction = Vector(target) - camera.location
+    camera.rotation_euler = direction.to_track_quat("-Z", "Y").to_euler()
+
+
+def main():
+    args = sys.argv[sys.argv.index("--") + 1 :]
+    if len(args) not in (4, 5):
+        raise SystemExit(
+            "expected: lid-base.stl lid-accent.stl output-directory basename [orientation]"
+        )
+    base_path, accent_path, output_dir, basename = args[:4]
+    orientation = args[4] if len(args) == 5 else "usb_left"
+    angles = {"usb_left": 0, "usb_front": 90, "usb_right": 180, "usb_rear": 270}
+    if orientation not in angles:
+        raise SystemExit(f"unknown lid orientation: {orientation}")
+    os.makedirs(output_dir, exist_ok=True)
+    bpy.ops.wm.read_factory_settings(use_empty=True)
+    models = [
+        import_mesh(base_path, "Lid base", (0.16, 0.42, 0.72, 1.0)),
+        import_mesh(accent_path, "Accent inlays", (0.95, 0.42, 0.08, 1.0)),
+    ]
+    # Lid exports are print-oriented with the decorated exterior face down.
+    # Turn both aligned parts over and present the configured USB edge in its
+    # named position so previews inspect the finished face as the user will.
+    for model in models:
+        model.matrix_world = (
+            Matrix.Rotation(math.radians(angles[orientation]), 4, "Z")
+            @ Matrix.Rotation(math.pi, 4, "X")
+        )
+    bpy.context.view_layer.update()
+
+    corners = [obj.matrix_world @ Vector(corner) for obj in models for corner in obj.bound_box]
+    mins = Vector([min(v[i] for v in corners) for i in range(3)])
+    maxs = Vector([max(v[i] for v in corners) for i in range(3)])
+    center = (mins + maxs) / 2
+    span = max(maxs - mins)
+
+    world = bpy.data.worlds.new("Inspection world")
+    world.use_nodes = True
+    world.node_tree.nodes["Background"].inputs["Color"].default_value = (0.035, 0.04, 0.05, 1)
+    world.node_tree.nodes["Background"].inputs["Strength"].default_value = 0.5
+    bpy.context.scene.world = world
+
+    camera_data = bpy.data.cameras.new("Camera")
+    camera = bpy.data.objects.new("Camera", camera_data)
+    bpy.context.collection.objects.link(camera)
+    bpy.context.scene.camera = camera
+    camera.data.type = "ORTHO"
+    camera.data.ortho_scale = span * 1.35
+
+    key_data = bpy.data.lights.new("Key", type="AREA")
+    key_data.energy = 900
+    key_data.size = span
+    key = bpy.data.objects.new("Key", key_data)
+    key.location = center + Vector((span, -span, span * 1.5))
+    bpy.context.collection.objects.link(key)
+
+    scene = bpy.context.scene
+    scene.render.engine = "BLENDER_WORKBENCH"
+    scene.render.resolution_x = 800
+    scene.render.resolution_y = 600
+    scene.render.resolution_percentage = 100
+    scene.render.image_settings.file_format = "PNG"
+    scene.display.shading.light = "STUDIO"
+    scene.display.shading.color_type = "MATERIAL"
+    scene.display.shading.show_shadows = True
+    scene.display.shading.show_cavity = True
+    scene.display.shading.cavity_type = "BOTH"
+
+    for view, direction in {"iso": (1, -1, 0.8), "top": (0, 0, 1)}.items():
+        camera.location = center + Vector(direction).normalized() * span * 2.2
+        look_at(camera, center)
+        scene.render.filepath = os.path.join(output_dir, f"{basename}_{view}.png")
+        bpy.ops.render.render(write_still=True)
+
+
+if __name__ == "__main__":
+    main()
@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+"""Combine aligned lid meshes into one slicer-friendly multipart 3MF."""
+
+from __future__ import annotations
+
+import argparse
+import copy
+import zipfile
+from pathlib import Path
+from xml.etree import ElementTree as ET
+
+
+CORE = "http://schemas.microsoft.com/3dmanufacturing/core/2015/02"
+ET.register_namespace("", CORE)
+
+CONTENT_TYPES_XML = b'''<?xml version="1.0" encoding="UTF-8"?>
+<Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">
+  <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/>
+  <Default Extension="model" ContentType="application/vnd.ms-package.3dmanufacturing-3dmodel+xml"/>
+</Types>
+'''
+
+RELATIONSHIPS_XML = b'''<?xml version="1.0" encoding="UTF-8"?>
+<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships">
+  <Relationship Target="/3D/3dmodel.model" Id="rel0" Type="http://schemas.microsoft.com/3dmanufacturing/2013/01/3dmodel"/>
+</Relationships>
+'''
+
+
+def load_mesh(path: Path) -> ET.Element:
+    with zipfile.ZipFile(path) as archive:
+        root = ET.fromstring(archive.read("3D/3dmodel.model"))
+    mesh = root.find(f".//{{{CORE}}}mesh")
+    if mesh is None:
+        raise ValueError(f"{path} does not contain a 3MF mesh")
+    return copy.deepcopy(mesh)
+
+
+def model_xml(base: Path, accent: Path, title: str) -> bytes:
+    root = ET.Element(
+        f"{{{CORE}}}model",
+        {
+            "unit": "millimeter",
+            "{http://www.w3.org/XML/1998/namespace}lang": "en-US",
+        },
+    )
+    ET.SubElement(root, f"{{{CORE}}}metadata", {"name": "Title"}).text = title
+    ET.SubElement(root, f"{{{CORE}}}metadata", {"name": "Generator"}).text = (
+        "feather-case-wizard"
+    )
+    resources = ET.SubElement(root, f"{{{CORE}}}resources")
+    materials = ET.SubElement(resources, f"{{{CORE}}}basematerials", {"id": "1"})
+    ET.SubElement(
+        materials, f"{{{CORE}}}base", {"name": "Lid base", "displaycolor": "#D1D5DB"}
+    )
+    ET.SubElement(
+        materials,
+        f"{{{CORE}}}base",
+        {"name": "Accent inlays", "displaycolor": "#F97316"},
+    )
+
+    for object_id, name, source in (
+        (2, "Lid base — Filament 1", base),
+        (3, "Accent inlays — Filament 2", accent),
+    ):
+        obj = ET.SubElement(
+            resources,
+            f"{{{CORE}}}object",
+            {
+                "id": str(object_id),
+                "name": name,
+                "type": "model",
+                "pid": "1",
+                "pindex": str(object_id - 2),
+            },
+        )
+        obj.append(load_mesh(source))
+
+    assembly = ET.SubElement(
+        resources, f"{{{CORE}}}object", {"id": "4", "name": title, "type": "model"}
+    )
+    components = ET.SubElement(assembly, f"{{{CORE}}}components")
+    ET.SubElement(components, f"{{{CORE}}}component", {"objectid": "2"})
+    ET.SubElement(components, f"{{{CORE}}}component", {"objectid": "3"})
+    build = ET.SubElement(root, f"{{{CORE}}}build")
+    ET.SubElement(build, f"{{{CORE}}}item", {"objectid": "4"})
+    return ET.tostring(root, encoding="utf-8", xml_declaration=True)
+
+
+def bambu_model_settings_xml(title: str) -> bytes:
+    root = ET.Element("config")
+    obj = ET.SubElement(root, "object", {"id": "4"})
+    ET.SubElement(obj, "metadata", {"key": "name", "value": title})
+    for part_id, name, extruder in (
+        (2, "Lid base — Filament 1", 1),
+        (3, "Accent inlays — Filament 2", 2),
+    ):
+        part = ET.SubElement(obj, "part", {"id": str(part_id), "subtype": "normal_part"})
+        ET.SubElement(part, "metadata", {"key": "name", "value": name})
+        ET.SubElement(part, "metadata", {"key": "extruder", "value": str(extruder)})
+    ET.SubElement(root, "assemble")
+    return ET.tostring(root, encoding="utf-8", xml_declaration=True)
+
+
+def write_entry(archive: zipfile.ZipFile, name: str, data: bytes) -> None:
+    info = zipfile.ZipInfo(name)
+    info.create_system = 3
+    info.external_attr = 0o100644 << 16
+    info.compress_type = zipfile.ZIP_DEFLATED
+    archive.writestr(info, data)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("base", type=Path)
+    parser.add_argument("accent", type=Path)
+    parser.add_argument("output", type=Path)
+    parser.add_argument("--title", required=True)
+    args = parser.parse_args()
+
+    args.output.parent.mkdir(parents=True, exist_ok=True)
+    with zipfile.ZipFile(args.output, "w", zipfile.ZIP_DEFLATED) as archive:
+        write_entry(archive, "[Content_Types].xml", CONTENT_TYPES_XML)
+        write_entry(archive, "_rels/.rels", RELATIONSHIPS_XML)
+        write_entry(
+            archive,
+            "3D/3dmodel.model",
+            model_xml(args.base, args.accent, args.title),
+        )
+        write_entry(
+            archive,
+            "Metadata/model_settings.config",
+            bambu_model_settings_xml(args.title),
+        )
+
+
+if __name__ == "__main__":
+    main()