Minimal In-Line Fidget Spinner

My children wanted to play with a fidget spinner I'd printed from here but it was too big for their little hands so I set out to design the smallest one possible. These are the commonly used 608 bearings. The two outer bearings snap into place, just make sure you support the arm it's on while fitting. The middle one is held in by friction and a small lip on the underside. It also has the benefit of using very little material so it's ideal for short leftover filament.

UPDATE: Added files: In