Thingiverse
Fidget spinner with built in plastic bearing using 3/8" nuts by drcameron
by Thingiverse
Last crawled date: 4 years, 6 months ago
I used the center bearing idea from https://www.thingiverse.com/thing:2237509. Don't expect to pull out the stopwatch to time spins, however it is very satisfying. Print it laying down flat.