Planetary Fidget Spinner

As a mechanical engineering student, I thought it'd be interesting to try to make a fidget spinner which uses planetary style gears, so here you go! It can be spun conventionally like a fidget spinner, or you can hold the rest still and spin the gears! Or roll it on your back for a back scratcher, etc. See print instructions below. The design uses tight tolerances and the actual gear involute profile, so it needs to be printed correctly to work.

1. Make sure you print each gear by itself if your printer has any remote stringing issues, and with minimize perimeter crosses setting checked. It's difficult to sand in between gear teeth, so if any strings get there the gears won't mesh.
2. You'll likely have to drill out the holes in the center of the planetary fork and planetary receiver (use a 1/4 inch drill bit). The bottom layer is often wider than the rest and will interfere with the hole.
3. Make sure the bottom side of the center gear is on the opposite side of the spinner as th