A bead spinner for stringing beads. I could not find one using a skate bearing, so I made this. Has room to fit 2 standard skate bearings, thought 1 will probably be fine.

3D printing settings

Use at least 20% infill, Supports may or may not be necessary. I used them, they were difficult to remove, and im not entirely sure they were necessary. I printed this in PETG, but I don't see any reason other materials wont work just fine.