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 two 3x8x4 ball bearings and a 3mm dia, 32 mm long shaft. The fidget should spin for 30-35 sec. If you hold it between your thumb (bottom) and index (top) fingers and give it a good spin, lift up your index finger, and have it rest on the thumb only. it'll start to precess which is cool to watch.
Happy printing. Don’t forget to check out my website and awesome printers www.nalanengine.com
https://youtu.be/N19Vf9UxbMc
https://youtu.be/BsHcD4Qpp74