Hand Spinner Fidget With Ball Bearings

thingiverse

I designed this fidget toy to reduce the number of bearings needed compared to similar designs. I used a cheaper 22mm double shielded bearing at the center. I removed the shields with a pick (be careful) and cleaned it out with brake cleaner and compressed air. This increased the spin time from 10-20 seconds to over a minute. I chose 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 and really get it moving. I used 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 pressed in by hand with an audible click. Print Settings Printer Brand: SeeMeCNC Printer: 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. I then 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 don't come loose, I wet each with acetone before installing in the spinner to "weld" them in place. This will only work if ABS is used.