Hello, here's a 3 inches wide MakerDeck Super Spinner. For this print, you will need some 6mm BBs (can be metal or AirSoft BBs).

SpinnerShell.stl : 
Print at 100% (YOU CANNOT RE-SCALE THIS MODEL, BBs WON'T FIT)
10-15% infill is fine
4mm nozzle at 0.2 layer height or better
*** You can add a PAUSE/COLOR CHANGE for the “M” to be a different color ("M" is 2mm thick)

ColorParts.stl : (you can print them in different colors, 6 total, or print white and paint them)
Depending on your printer tolerance, might need to be scaled down (in my case 96% works fine) Print one to test fit !
10-15% infill is fine
4mm nozzle ar 0.2 layer height or better

You will need 34, 6mm BBs. To insert them (after the print is done) on the face facing the bed (or opposite side with the “M”) you will need to align the 2 half holes (see picture) and push them in one by one.