I made several of these on my Prusa Mendel i2 several years ago but was never able to make one that would move. I have a new printer with much better precision control, and this printed easily, supports removed cleanly, and the bearing turns beautifully. Thanks for showing me how lame my old printer is.
Printed with Cura using SpoolWorks filament. The supports initially held on strongly to the individual balls, but with a little pressure with a pocket knife, each one popped off cleanly leaving a smooth, round ball.