Forget materials such as metals and plastics, engineers at the University of Exeter have developed the world’s first chocolate 3D Printer.This manufacturing method enables for customized chocolate designs, made by the consumers themselves. The system integrates flexible manufacturing with a web interface which facilitates for individual design and design collaboration with others.  It works by feeding melted chocolate through a number of tubes which distribute the chocolate on a bed according to the designdictated by computer software. University of Exeter engineers have designed a software for consumers to easily develop their designs which are then converted into CAD files used by the printer. It is expected that the machine will be highly effective in promoting 3D printing technology to a wider range of people, while also utlised as an enjoyable tool for student development in design technology.

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From http://xkcd.com/924/