u/Dry_Physics_3417

I'm a high school biology teacher starting our unit on evolution. I thought a cool introductory activity would be having students sort and classify skulls of human ancestors (from Australopithecus on). I know places like the Smithsonian have digital 3d models, but I thought it would be more interesting if the students could physically handle the skulls. Does anyone know of or have any high-quality 3d print models (file types: .stl, .obj, or .3mf) of these skulls?