In China, surgeons have completed a very complicated surgery in which they separated a 3-year-old little girl's jaw which had been fused together from birth. In order to do so, they 3D printed an exact 1:1 scaled replica of the child's jaw and practice surgery on it before taking part in the actual operation. This allowed them to get a better handle on exactly what needed to be done, and ultimately led to a successful real surgery. Read and see more at: http://3dprint.com/72888/3d-printed-jaw-model/