I found the original scan file from http://www.123dapp.com/catch/mayan-skull/4946520. I cleaned up the file and sculpted a bottom for it. It is still a huge file with a lot of triangles. I am new to 3D printing and I was afraid if I took too many triangles out I would lose a lot of the detail. After printing in PLA I sanded what I could, then primed and painted it. I am very pleased with the final result :)
You can print with less infill, I just like the weight it gave the skull.