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Maybe CAD models for 3D printers? Something like Thingiverse, at the very least.

I'd imagine you also need repositories of processes and assembly instructions.

All the designs we're drawing for https://wiki.replimat.org/wiki/Main_Page are done using our branch of https://github.com/nophead/NopSCADlib which contains some work yet to be upstreamed here: https://github.com/timschmidt/replimat

That seems like the kind of things we ought to know inside and out before starting.