Additive manufacturing—or 3-D printing—is expected to help at least one competitor seeking to build the next $1 billion U.S. Air Force rocket engine to accelerate design and production time, but one industry executive warns that a hasty rush to 3-D printing can be dangerous. That parts can be produced faster with 3-D printing does not mean engineers can cut corners. A fervent advocate of the technology, Jay Littles, director of advanced launch programs at Aerojet Rocketdyne, ...


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