Tired of the little ghouls ringing your doorbell? Here is the Skeletal Hand Knocker. It is a functional knocker that can be attached to a door and used. It can be attached via Command Strips so that there is no damage to the door when removed, double back tape, or, there are a couple of holes in the .3MF versions that you can put a nail or screw head into. It is best made from an outdoor-safe material such as PETG. I have included a basic 3MF version as well as two STL files for the two pieces; these can be found under the Download STL/CAD Files section. I have included a free commercial license for those of you who would like to sell your printed models.