Here is a nice Terminator T800 animatronics with red eyes and a moving jaw!
I should mention that the original file I based the head on is Landru's famous file: https://www.thingiverse.com/thing:18317.
All credits and compliments for the drawing are his.
I only fixed the jaw and added the electronic part.
If the file receives at least 100 likes or 100 downloads, I will post the arduino code I used and the wiring diagram here, so happy downloading