A couple of us on reddit have been working on a mod to install 8mm BTUs in the Ploopy trackball. They're a little smoother-feeling and significantly lower friction than the stock roller bearings. The particular BTU it's designed for is the Bosch-Rexroth R053010810, aka the KU-B8-OFK.
It would be cool to have this mod included in the official repo! v3 is finished and tested but I haven't yet tried printing v4 (12 hours is quite a commitment for me! And v3 is working well).
So far I've added the STL and STEP files and also included the FreeCAD file for version 4. They're pretty large files (79MB total) - let me know if you'd rather not increase the repo size that much.
A couple of us on reddit have been working on a mod to install 8mm BTUs in the Ploopy trackball. They're a little smoother-feeling and significantly lower friction than the stock roller bearings. The particular BTU it's designed for is the Bosch-Rexroth R053010810, aka the KU-B8-OFK.
It would be cool to have this mod included in the official repo! v3 is finished and tested but I haven't yet tried printing v4 (12 hours is quite a commitment for me! And v3 is working well).
So far I've added the STL and STEP files and also included the FreeCAD file for version 4. They're pretty large files (79MB total) - let me know if you'd rather not increase the repo size that much.