It's coming. Soon you'll be able to scan parts of your body at home and print them out. Earlier today I wrote about 3D medical scans and the 3D printing happening in the UK on the MakerBot blog, but I can't get my mind off of it. It is very cool that you can get your fetus scanned, even if you don't have siamese twins! Once it's scanned you can get it 3D printed. Super bonus points to the first person to put a scanned medical image on Thingiverse. This is just the beginning of the scanning and 3D printing revolution in the medical sector.
Imagine this: Every month, I get a body scan that documents many layers of my biology from bones to nervous system. Then, one day, I break my finger and print out a replacement on my MakerBot made out of PLA, which is a bio-compatible plastic we're in the process of manufacturing. I bring it to the surgeon who has his office, not in a huge medical complex, but in his office around the corner. He replaces the bone as if it's a spare tire and I'm good to go.
This isn't science fiction. This is five minutes into the future.