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3D printers recently made it into space when a 3D printer specially designed to operate in micro-gravity was installed on the international space station (ISS):


The 3D printer is especially useful in space, where it is not a trivial matter of going back to pick up something “left at home”. Astronauts recently needed a wrench, so engineers on earth quickly drew up a design for the tool and emailed it up to space where the tool was printed in about 4 hours: