I had a bunch of 624zz bearings and a whole container of BBs that I wanted to incorporate. This spinner doesn't spin the longest, but it's great for smaller hands. Just print and then tap bearing and BBs into the holes gently. Caps press fit in the middle.
I printed in Atomic Filament Glow in the Dark PETG and it looks cool when it has a full charge.
I have a 0.4 nozzle and it might come out cleaner with a 0.2. Works great as is.
BB tray included so they're not rolling all over the place while you're working with them!