Print-on-demand technology -- utilized by companies like Vistaprint and CafePress -- has become widely implemented over the last decade as digital printing has steadily replaced costly letterpress plates and other complicated methods. At the same time, 3-D printers (like our favorite, the MakerBot) have become more commonplace in the manufacture of products and prototypes. And, now, biotech outfit Invetech has merged the two technologies, replacing printer ink with living cells. That's right: a 3-D, on-demand human tissue printer.
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