Conservation of Angular Momentum Fidget Spinner

cults3d

This spinner picks up speed as it loses momentum. When first spun, the magnets move to the outer edges. Then, as it begins to slow down, the magnets shift to the inside position, causing it to spin faster. Inspired by example prints from whosawhatsis's book, 3D Printed Science Projects. Use the following: 1 - ceramic 608 bearing: This bearing must be non-magnetic, or else the magnets will stick and add a lot of drag. They are also available on Banggood at a lower price. 4 - 10mm cylinder magnets: Be careful with these magnets as they are very strong and somewhat brittle. They should be set to attract each other. Insert them from the bearing cavity, and there is a small ledge near the bearing that holds them in place so they do not hit the bearing when they move. The ledge makes it harder to insert the magnets, but they will move freely once past it. Atomic Filament Amethyst Violet Gemstone Translucent PLA. Atomic Filament Translucent Ruby Red PETG. June 2017 Update: A new version was uploaded which works without an expensive central bearing. August 2017 Update: I added a R188 ceramic bearing version to this thing. I also found that thinner magnets give you more flexibility to adjust the speed where the magnets transition. As pointed out by tbuser, you can get the magnets at Amazon. Affiliate links are included.