Three-D printing, or additive manufacturing, of polymer parts for aircraft interiors is decades old. But metal is not naturally a convenient liquid, and metal aircraft parts tend to be safety-critical, so printing metal parts has taken longer to advance. Nevertheless, the pace of metal printing is picking up. It started with an OEM of engines, where weight and performance are critical. It is now spreading well beyond to a variety of components and structures. OEMs are also diversifying ...

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