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POPSPortable 3d printer Also takes non-conventional building materials (like cheese,) and he says could be useful in space exploration (print the robot, print tools it needs to explore, print another robot if needed, ect) http://www.popsci.com/popsci/technology/19ad302897772110vgnvcm1000004eecbccdrcrd.html?s_prop16=%20RSS:home