I wanted to try to design one of these kind of fidgets, and this came out better than I expected.
It does not move around quite as much as I'd like, but works fine anyway.

For this one I used;
PLA with 220C temp.
0.18mm layer height
15% infill
Print speed 60mm/s

I'm going to make some little changes to the design when I have time, and print with better settings.