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Boeing Co has hired a small company to make about 600 3D-printed parts for its Starliner space taxis, meaning key components in the United States manned space program are being built with additive manufacturing. The company, privately held Oxford Performance Materials, will announce a $10 million strategic investment from advanced materials company Hexcel Corp as early as Friday, adding to $15 million Hexcel invested in May and lifting Hexcel's equity stake to 16.1 percent, Oxford and Hexcel said. Boeing's award of the parts for its flagship space program and Hexcel's funding are strategic bets that printed plastics can perform flawlessly even under the extreme stress of a rocket launch and sub-zero temperatures of space. They offer further evidence of a shift in 3D printing from making prototypes to commercial production of high-grade parts for space ships, aircraft engines and other critical equipment. Oxford's parts will help Boeing lower costs and save weight on