penny spinner (one piece)
thingiverse
Built several standard 608 bearing spinners with the caps on hand. A few other penny spinners exist, featuring one made with a 3D printed bearing, but mine requires only pressing in 15 pennies. No bearing installation or glue application is necessary for the pennies. Use a socket to drive 5 pennies into each pocket. The central bearing functions more like a bushing, yet after spraying some WD-40, it spins reasonably well as a plastic bushing. This design can be printed without support, as it self-supports the structure.
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