608z Planetary Gear Bearing (customized from @emmett 's Gear Bearing) for fidget spinners. Don't feel like buying a bearing? Shipping too long? Try these instead! Same dimensions as a 608 ball bearing. 9 planets (multiple of 3) nicely compliment a triple spinner.
This is a challenging print, and obviously won't spin as well as a real bearing. Please note that this is not a very good substitute but is a fun alternative!