Anatomically correct human skull in full size 3D print model 3D model is available on CGTrader for $10. Original author: Hiropraktic.
STL (Stereolithography, filesize: 24 MB), OBJ (OBJ, filesize: 40.7 MB), 3DM (Rhinoceros 3D, filesize: 55.9 MB), BLEND (Blender, filesize: 31.2 MB), MAX (Autodesk 3ds Max, filesize: 13.2 MB)