I've seen a few print in place fidget spinners and decided I do want to get in on the game. So I've designed one myself. This here is a 4 arm fidget spinner and each arm spins. It was designed after I tried the Tri-Force spinner and learned that these things are pretty neat to make and play with.
Anyways the design is pretty simple and should work on most moderately tuned 3D printers. The integrated bearings are pretty loose but it spins decently well (Although I don't have any actual fidget spinner as a reference)
I also used 4 walls and a Hex fill.