I found a different skull that I wanted to print so I sliced it up for printing. The jaw should fit better on this model....
3d model print parameters
Print all the pieces and glue them together. There is an alternate Mandible Top that has a strap for a rubber band. So if you screw a hook in the bott...om of the skull then you can use that strap to hold the mandible on. I got the original from Grabcad and then sliced it up to print. http://grabcad.com/library/skull-1