Hand Spinner Fidget With Ball Bearings

thingiverse

I engineered this fidget toy to minimize the number of bearings required compared to comparable designs. I selected a more affordable 22mm double shielded bearing for the center, then removed the shields with a pick (exercise caution) and cleaned out the debris with brake cleaner and compressed air. This modification increased the spin time from 10-20 seconds to over a minute. I opted to install a 5/16" thumb nut and button head cap screw through the center bearing. The added standoff distance helps keep your hands clear when spinning and allows for placing the spinner on a flat surface, really getting it moving. I utilized 3/8" diameter ball bearings for the outside weights. The model is sized at .018-.019" oversized for the bearing and balls as my prints typically shrink that amount. Scale as needed for desired fit. When I printed the bearings and balls, they pressed in by hand with an audible click. Printer Details Printer Brand: SeeMeCNC Printer Model: Rostock MAX v2 Rafts: No Supports: No Resolution: 0.25mm Infill: 20% Notes: Printed using ABS filament. I used a 5mm brim and ABS slurry on the bed (90 degree) for adhesion. My printer has an e3D v6 hot end upgrade but is otherwise stock. Post-Printing After printing, I removed the brim. Then, I sanded with 220 grit sandpaper to smooth all faces and edges. Following that, I used small amounts of acetone on a rag to create a glossy finish. To ensure the bearings and balls remain securely in place, I wet each one with acetone before installing them in the spinner to "weld" them in. This method will only work if ABS is used.