Ok, this is really a groundbreaking product. A company called Structur3d Printing is planning on launching a kickstarter campaign for the Discov3ry extruder add-on. It will allow you to print in dozen of new materials, including polyurethane, latex, silicon, wood filler, clay, ceramics, sugar icings, peanut butter, nutella, Play-Doh®. It will be priced at under $350 and can be used on just about any FDM 3D printer. More details at http://3dprint.com/3636/discov3ry-extruder-add-on