As per a request, here's a Memphis Grizzlies fidget spinner. This spinner uses (3) 1/2" ball bearings and one 608 bearing. This spinner is only about 3-1/2" in diameter overall.
I would heat up the print and ball bearing with warm water and the bearings will slip in.
Printer Brand:
PowerSpec
Printer:
PowerSpec 3D Pro
Rafts:
No
Supports:
No
Resolution:
0.2mm
Infill:
50%
