Aerojet Rocketdyne has built and successfully hot-fire tested an entire 3D-printed rocket engine. The Baby Bantam demonstration engine was made entirely with additive manufacturing, which reduced part count from dozens of components to only three. Total design and manufacturing times were cut from over a year to just a couple of months, and costs were reduced by about 65%. 

Renaissance Services has successfully manufactured 3D printed components for jet engines.

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