This is a great story. Surgeons in Spain have used 3D Printing to remove a tumor in a 5-year-old little boy. The tumor had been considered to be inoperable due to the large amount of blood vessels and arteries surrounding it. Fortunately, using 3D printed models of the tumors, the surgeons could practice surgery for 10 days on the 3D models prior to taking part in the real surgery. The real surgery was a success, thanks to 3D printing. Read more about this at http://3dprint.com/7885/3d-printing-tumor/