HOUSTON—A small plastic ratchet wrench has been generated aboard the U.S. segment of the International Space Station (ISS) using a prototype 3-D printer delivered to the six-person orbiting space laboratory in September, demonstrating a print-on-command capability for the first time. The 104-layer plastic ratchet, which is considered a nonfunctioning test article, measures 4.5 in. long by 1.33 in. wide. NASA is pursuing a space-based additive manufacturing capability with Made in ...

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