Surgeons Replace 75% of Guy's Skull —Using 3D Printer It's the latest marvel for the nascent technology By Matt Cantor, Newser User Posted Mar 12, 2013 2:22 PM CDT 39 comments Comments Experts 3D-printed most of a skull. (Oxford Performance Materials) (Newser) – The world of 3D printing continues to impress: Now, experts have used it to replace three-quarters of a man's skull. The team obtained images of the needed skull sections using CT scans; they then made the replacement by layering a special type of plastic known as PEKK, whose rough surface helps with bone cell growth, Science News reports. The FDA approved the process last month, and the surgery occurred March 4. Doctors will be monitoring the patient for any future complications.