Recently a pair of scientists spoke at the Geological Society of America conference in Baltimore about the benefits of converting 3D topographical data from the surface of the Moon and Mars into 3D printable models. It can help researchers understand lunar and martian geologic history, determining the sequences of their geologic events and understand the structure of impact craters. It is also a useful tool for learning about the geophysics involved with planets and asteroids. You can earn more about the educational benefits of 3D printed impact craters over on 3DPrint.com: http://3dprint.com/105677/3d-printed-craters-moon-mars/