This is a fidget spinner that takes 22mm by 7mm (inside 8mm) bearings commonly used in skate boards, and scooters. It uses 5/16"-18 nuts for weights. The cap is a modified cap design from https://www.thingiverse.com/th... The design on the caps is the Halifax Robotic Logo. Printed on Geeetech Prusa I3 M201 40-50% infill any layer height only support on caps Caps must be printed flat side up or the design in the middle will most likely get mushed together