These adapters saved me from a reprint when I wanted the static ball bearings but forgot to change the trackball type from roller bearings. Hopefully they're helpful if you find yourself in the same situation, or you'd like to switch from roller bearings to ceramic ball bearings (which I find nicer to use).

The adapters are designed to have 0.2mm of tolerance between the keyboard case and the inserts.

I have only made this for 34mm trackballs, but I can make other sizes on request.

Generated in OpenSCAD with:

difference() { import("trackball-ball.stl"); minkowski() { import("trackball-roller.stl"); cube(0.4, center=true); } }