This is the skull of Panoplosarius (completely armored lizard), which I made from a CT scan.
Sketchfab: https://sketchfab.com/models/f8764fdeb570429e80015d9cc067f65d
The owner of the CT dataset is Ohio University. http://www.ohio.edu/people/witmerl/DinoSinuses_main.htm
The model is in its original size and have to be resized prior printing. The mandibula is a separate object and can be printed separately. All holes, grooves and the cranial cavity was on the CT scan and are not artefacts, they are actual features of the skull. The model needs some cosmetic job, but its complete in its current state.