<2mm Wheel Collar

thingiverse

This is a simple wheel collar to work on axles of ~2mm or less. I used mine on the Eclipson model C, but it will work on anything. You just need an M2x4 bolt or grub screw. When printed, just force the bolt in and turn to drive it in, it will be tight, but that's the point, once the bolt has carved the threads it will be easy to adjust!