Decided to make this into a key chain from the original work by AndyGadget at http://www.thingiverse.com/thing:455093 I used the stls not found in his zip for this. If you work with the source you can remove the key chain hole towards the end of the source tree. . There is a Snap Fit version of this now http://www.thingiverse.com/thing:482840 From the original I repost his instructions - The rotor sits on the spindle and then the lid is glued on with cyanoacrylate adhesive. However, you will get best performance if you slightly sand the parts in contact to get rid of any roughness left from the printing. A few drops of light oil in the works before gluing will help things too. Reducing friction is the name of the game.