Octahedron Bevel Gear Fidget Spinner

thingiverse

I'm proud to claim this as the world's first handheld fidget spinner with precision bevel gears! This toy can be enjoyed in multiple ways: rolled around on your palm, held on two corners on the center-hub and watch all 8 gears spin in perfect sync, or held on two opposite-face gears and observe the middle 6 gears revolve. You might even discover more creative ways to play with it! For mathematically inclined audiences, this toy features 8 bevel gears arranged in an intricate pattern inspired by the surface of an octahedron. The center hub is a masterfully designed truncated octahedron. This fidget spinner is not intended for high-speed spinning or long periods of rotation. Its purpose is to provide a delightful mechanical motion experience that will captivate your senses. Print, assemble, and get ready to have fun! To bring this toy to life, you'll need to print the following parts: * 1x CenterHub * 8x BevelGear * 8x Sleeve In addition, make sure to acquire the necessary components: * 8x 625 Ball Bearings (ID = 5mm, OD = 16mm, T = 5mm) * 8x M3x20 Flathead/Countersunk bolts * 8x M3 Nuts * 24x M3 Washers Now, let's move on to the assembly process: 1. Assemble a total of 8 Gear Sub-Assemblies. Follow the images for detailed instructions. The sleeve is inserted inside the inner diameter of the bearing to maintain alignment, while the two-layer M3 washer provides 1mm spacing between the bearing and gear. (Feel free to substitute these components with alternative parts if you find better options.) 2. Insert the ball bearing end of each Gear Sub-Assembly into the corresponding hole on the center hub. The hub is designed for a friction fit, so you may need to use a file or glue depending on your 3D printer's output. For a simple assembly guide, check out this video: https://www.youtube.com/watch?v=H_NhFbz7sxU. Pro tip: Degrease the bearings with ethanol or other degreasing agents (such as IPA or acetone) to ensure smooth spinning.