It's been the same way for decades. If you break an arm, a leg or a finger, doctors usually will put a plaster-based cast on that broken bone, holding it in place to allow it to heal for 6 weeks or so. Now, one Russian company has come up with a way to 3D print casts, and then form them to a patient's arm via heat. Read and see more about this process at http://3dprint.com/43103/3d-printed-cast/