The range of technologies, techniques and approaches that are being described as 3D Printing continues to expand. Here, a "3D printer" uses living cells to produce a human kidney.
http://scopeblog.stanford.edu/archives/2011/03/3d-printer.html
"Researchers at the institute have developed a technique and equipment for printing transplantable organs. The seven-hour process begins with collecting 3-D images of the organ that needs to be replaced. Next, a small tissue sample is taken from the patient and used to seed a specially-designed printer. The printer then replicates the tissue layer by layer to create a new organ"
Play the video at TED here
http://www.ted.com/talks/view/id/1088
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