Members Only Model
Jaw is movable like the large model - I added a ring for the keychain and also fused the teeth so it's easier to print. You can print the Jaw +-2%-4% if you feel it's too lose or too tight but it should be just right.
V2 Update: I made the jaw hinges bigger - you have to push the jaw inside really hard to snap it in - Result - Jaw does not easily disconnect from the Skull + It does not open by itself and stays closed.