Rotary Fidget

Please accept this fidget from Nalan Engine LLC. This is my first fidget, and I hope it’s not the last. It uses 3x8x4 miniature ball bearings. There are three 1/4”-20 crown nuts (10.8 hex by 7.6 tall) inside the flywheels to provide extra inertia. Print and de-burr two flywheels, and two thumb knobs. Place the nuts inside the flywheels, and glue the two halves together (use ca glue for abs). Install the bearings, the shaft & the thumb knobs.
I took apart a computer (server) fan, and it has tw