## Source

- "Lego compatibility??? 3D printing this is hard so do some research"
- "Broader hardware support (gears, cogs, etc.)"
- "CAD styling modelling??? - <https://zoo.dev/blog/kcl-3>"

## Current state

`cad/DESIGN.md` already claims an 8 mm LEGO-Technic-compatible lattice, plus a dovetail rail and M3 load paths. The claim has not been validated with printed parts in this repository.

## Acceptance

- [ ] Define the fit-test plan for the lattice. If a printer is available, print a coupon from `cad/lib/interlink.scad` and record material, orientation, printer and measured tolerances; otherwise record the plan and risks.
- [ ] Test the dovetail and M3 load paths under motor reaction torque; record where they loosen or creep.
- [ ] Decide whether parts are meant to be home-printed or ordered from a print service, and document the constraints.
- [ ] Evaluate a KCL-style parametric CAD approach against the current OpenSCAD sources; record whether to adopt it.
- [ ] Decide the support level for gears, cogs and other mechanical parts, including how each maps into the manifest/runtime.
- [ ] Define a prototype plan for at least one gear or cog if the decision is to support them; do not build it in this spec-only phase.
- [ ] Update `cad/DESIGN.md` and the hardware repository with the findings.

Not the in-app 3D printing feature tracked in #38; this is the mechanical design research behind it.


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