I just got my open source ploopy mouse and headphone kit today. And I’m going to have fun assembling it!

https://ploopy.co/mouse/

Ploopy is totally open source, including the PCB, the 3D print files, and the drivers. Thought it might be fun to do everything from scratch, but the PCB they designed is a four-layer PCB which is very difficult to do at home. And ordering it from PCB Way cost more than just buying the kit directly from the ploopy people. Though I would get five PCBs at the minimum order volume, and if I was building five of these mice, it would probably be cheaper.

Wish me luck!