by tmorris9, published
I did not create this, I got it from GrabCad but I sliced the bottom off so it prints better and when printed it sits on the table better, won't wobble or tilt. I also scaled it down.
Here is the original http://grabcad.com/library/skull--6
You will more than likely need support. I used Slic3r 0.9.9 and it's support was really easy to clean off. Better than any other version so far.