update some deisng parameters and add new cases

cases/pan-tilt-head/README.md

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+# Pan/Tilt Head
+
+Generated by the Feather Case Wizard.
+
+- Top profile: `oled128x64`
+- FeatherWings: 3
+- Battery compartment: no
+- 1/4-20 insert: yes
+- Approximate exterior: 95.6 × 41.7 × 59.8 mm
+- Formats: 3mf
+- Parts: `body`, `lid`, `buttons`
+- Custom cutouts: 4
+
+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.
+
+To open the saved Customizer values manually:
+
+```bash
+openscad -p parameters.json -P pan-tilt-head source/feather_case.scad
+```
+
+The 3MF files contain portable geometry only. Choose printer, filament,
+plate, and slicing settings in Bambu Studio.