At long last, 3D printing has conquered its final frontier: space. NASA has successfully printed its first 3D object aboard the International Space Station. It's just a tiny faceplate that identifies the printer maker (Made In Space), but it's both a symbolic milestone and a source of valuable feedback for tweaking the printer's output. For instance, NASA now knows that parts stick to the print tray more in microgravity than they do on Earth; it's possible that plastic layers bond differently in orbit.