Summary Keychains and spinners are cool gadgets. why not combine them in a single object? you will need 2 M3 screws (long enought to hold all your keys), 2 M3 self-locking nuts and two 5x10x4mm bearings (You can find bearings here http://www.ebay.com/bhp/5x10x4-bearing). The complete version with many graphics is available here: https://pinshape.com/items/35428-3d-printed-spinner-keychain