I loved mtdna's tooth model and so did my son - but he wanted a smaller, stand-alone version to pocket. I wanted to be able to print them bulk as gifts to other children. Here is mtdna's Megalodon tooth modified with MeshLab 1.3.3 to remove the base and repair some holes in the mesh. This prints great stand-alone and in sets.I have had the most success by re-orientating the model so the tip is pointing up, and generating supports under the tooth root.  I have not had significant success printing this model in a flat orientation.