The jaw is separated from the original Oni Skull by Jooxoe3i. Here jaw and the skull are joined using a metallic pin. This is made in order to articulate for Halloween.

Creality

Ender 3

Yes

0.2

For animating the skull:

1. Print the hollow skull and jaw
2. connect the skull and jaw using some pins (create holes for the pin by heating the pin and poking the skull and jaw---make sure to align the holes so as to get free motion)
3. create another hole on the jaw (on one of the protruding portions) and on the skull
4. tie a thin cable (copper wire extracted from electrical wiring) on the jaw (at the hole) and pull it to the hollow portion of the skull through the hole in the skull.
5. stick a servo motor inside the skull and tie the wire to it. program the motor to run reciprocating motion
   {alternatively-- make the reciprocating motion by bending a rod in 'Z' shape and attaching it to an ordinary dc motor}