Steel Ball Spinner

This is a simple spinner that I made. Should fit 15 mm (Correction: not 1/2 inch) Steel balls snugly. With good bearings it should spin for a good amount of time.

I've included two versions, one with 15.5 mm holes and one with 16 mm. I haven't tested either of these yet but they should work better than the one in the photo with only 15 mm holes. (Had to melt the plastic a bit)

-By the way, I got the steel balls from an old Magnetix set.

UPDATE: Added a 15 mm and 15.2 mm versions for a tighter fit.