tri fidget toy (more momentum, less friction)
thingiverse
I pushed the bearings out just a little further to push out the weights successfully.\nBearing fits can vary, but not as much on the outer diameter, while the inner can be specified by C0-C5 (C3 is typical). When I printed the original part, the caps were very loose. These fit nice and snug now. Also, a bearing works best when the inner race is slightly wider than the outer race, and you should only touch the inner race. By adding a small step in the cap, it creates a gap on the outer race and spins freely effortlessly.
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