Check the making of video and how its assembled. https://www.youtube.com/Gravity Fidget Spinner Created this Gravity Fidget spinner with 10 mm steel balls the fidget with. The ball do rotate within the frame and feel nice rolling around. It use 608 bearings in the center. Print Settings Printer: Kossel XL Delta  Rafts: No  Supports: No  Resolution: 0.2  Infill: 80%