It seems like ever day there is another story about 3d printing being used within the medical field. Here is another story of such:

http://3dprint.com/1795/22-year-old-...m-replacement/

Doctors in the Netherlands gave a 22 year old woman an entire cranium implant. The implant was 3d printed out of plastic, and customized for this particular case. The woman has a rare disease which causes her skull bone to gradually thicken. Here is a picture of the implant: