I made one of these recently too. Mine is a quick’n’dirty torqbar knockoff.
If anybody else makes one of these, be sure to use a solvent to clean the lubrication from the bearing. It’s counter intuitive, but an unloaded bearing will spin faster and longer without lubrication.
I used 3/4" oak and pocketed it down to 3/8" thick. Here are my design files:
Spinner3.c2d (139.0 KB)
Buttons.c2d (10.3 KB)
If I do it again, I’ll make the buttons out of brass with a concave profile. The brass inserts are just 5/8" brass rod that I had laying around. I used my metal lathe to part them off to exact thickness to maintain balance. You could also use something like 1/2" nuts as weights if you don’t have brass.
Aside from a waste board and clamps, this is my first CNC project on my new SO3.