Thanks for your co tribute is to this discussion, it is a well reasoned opinion. In response to your question, there are a few articles easily found including

Thanks for your co tribute is to this discussion, it is a well reasoned opinion. In response to your question, there are a few articles easily found including a wiki page in 3D printed space craft. No manned rocket as of yet, but orbit has been achieved. https://additivemanufacturingtoday.com/spacex-uses-dmls-to-3d-print-inconel-superdraco-engine-chamber https://additivemanufacturingtoday.com/spacex-uses-dmls-to-3...