Single print, spinning planetary gear lapel pin

grabcad

The design leverages additive manufacturing by printing the assembled pin for spinning action. A planetary gear system inside facilitates opposite direction spin of the front face when twisting the exterior. Modelled pieces have at least 100 microns tolerance to prevent single object printing. Two slots on the back can hold blank, 1/2'' square lapel pins which may be glued for stability. Two pins are used to secure and stabilize the back during spinning. Graphite powder between joints might help in free spinning but requires tweaking due to lack of 3D printer testing. Support structures need careful design and placement.