US Navy looks to 3D printing to turn its city-sized aircraft carriers into mobile factories

I always think of that scene in Apollo 13: “We need to make this… fit into this… using this.” It’s a frustration that’s central to the whole film: how could we be able to send human beings all the way to the Moon and still be foiled by something as simple as the shape of a valve? More to the point, how could we send a rover all the way to Mars, and still worry about something as banal as a broken wheel or a bent rod?

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