The Newton - Fidget Spinner (Spins smooth!)
thingiverse
Though it might not look like it at first glance, this fidget spinner cleverly retains its center of mass exactly at the center bearing. Try spinning it out for yourself and discover that it still spins smoothly without any hiccups! It's built to use high-quality 608 skateboard or scooter bearings. To get the best results, a premium ceramic 608 bearing is highly recommended for the center. I've found these fantastic bearing caps by hodginsa to be really great: https://www.thingiverse.com/thing:1815244. Version 2 boasts an even tighter bearing fit, rounded fillets instead of sharp chamfers, and an upgraded .STL file.
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