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Enjoy this simple fidget spinner I designed in Creo CAD (Pro/E). Should only take an hour or so to print and should not require much finish or sanding. Uses standard 22mm skateboard bearings. The outer diameter is 152mm, and the thickness is 7mm.
Buy (4) 8x22x7mm Skateboard bearings for $5 on Amazon:
I have also included a step model that you can change and alter for your own needs. Have fun and share the forces of nature.