When the first 3-D printer designed to work in weightlessness is sent up to the International Space Station, as early as next week, it will mark one small step toward a giant leap for manufacturing in outer space.
"Imagine if you're going to Mars, and instead of packing along 20,000 spare parts, you pack along a few kilograms of 'ink,'" NASA astronaut Reid Wiseman said in a video recorded in March before starting his stint on the station. "Now you don't even need to know what part is going to break. You can j...
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