3D Printing: it may change everything, including spacecraft production.

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Risks with additive manufacturing:

Similar risks with other manufacturing methods, e.g. brazed-tube, or anything involving welding or deposition processes (e.g. channel wall construction). Whether laser-melted powder in a vacuum chamber or a handheld torch & braze rod in shirtsleeves, introduced defects can result in catastrophic failure. One advantage of layer-based AM in this regard is you have the opportunity to perform full cross-section inspection of the entire volume of the part during manufacture.