3-D printers are really cool & one could imagine an endless number of applications for such a machine. Colleagues of mine use them to make 3-D models of different biological structures (like a skeletal element in the wing of a stingray or a shark tooth) so they can test them in different conditions & measure parameters you wouldn’t be able to with a live animal/specimen. Although it totally makes sense, I didn’t realize that medical technology has already run with the idea and they have “printed” kidneys, which have already been successfully implanted in patients! Amazing! Should help fix the healthy kidney shortage. I’m sure they don’t come cheap though! Check out the article from Discovery News HERE.