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For those wanting to smooth the mating surfaces for even longer spins than it is already capable of right off the printer, squirt some toothpaste in between the gaps & spin it for awhile, then completely wash the toothpaste out of it with warm water. The mild abrasiveness of the toothpaste polishes the mating surfaces for a smoother/longer spin. [ NOTE: I can't take credit for this hint . . . I got it from 3xploder0 (https://www.thingiverse.com/3xploder0) in the comments section of the "Gear Bearing" (https://www.thingiverse.com/thing:53451) ]


Gear Bearing
by emmett