There is a 3D printer now in the International Space Station. The 3D printer was installed recently and has manufactured the first 3D printed object in space. This is great new for future long-term space expeditions. Replacement parts for repairs could be produced in space and astronauts need not rely on supplies from earth.
Pretty cool huh? If this works, future space expeditions just need to bring along a 3D printer and raw material. They can print out the stuff when they need it.