I have been wanting my own Terminator Skull for quite sometime and went through a couple of models that were on Thingiverse. Loved this design with the removable CPU and wanted to make some effects with it that resembled scenes from my All Time Favorite Movie....Terminator 2.
After the print finished I removed all support materials and sanded with high grit then low grit sandpaper. Used several coats of fill primer and finished off with several coats for Chrome paint.
Decided to use the CPU as a switch to activate the electronics inside. Seemed fitting as removing the CPU in the directors cut of the movie shut the T101 down. But also wanted some cool effects for the eyes. The CPU base and holder were hollowed out with a bur bit on die grinder and a small contact switch was installed. Used a 9V battery with micro voltage regulator to step down to 5V. The eyeballs where drilled out into the hollow cavity in the neck. I used 10MM Red LEDs and designed some clear 3D Printed Lenses to get a little closer to the real look of the eyes in the movie.
I decided to make the eyes not only light up but also have some eerie effects from the movie and starting writing code for the Arduino Micro inside. The scene I simulated with the eyes is the one in the Steel Factory where the T1000 stabs the T101 with the steel bar and basically kills him. So at 30seconds in my code the eyes start to dim out and it goes offline for 30seconds. Then, just as in the movie the T101's emergency system kicks in and re-routes the main power to revive him. So for the first 30 seconds of the power up cycle the eyes blink dim, several times and then fad in to full brightness.
I was very happy with the results and this model has now become one of my favorite desktop toys. I included the .STL file for the clear lenses and .ino file for the arduino code if anyone is interested.