SpaceX "3D Prints" their merlin engine chambers from the same alloy, inconel. http://www.spacex.com/news/2014/07/31/spacex-launches-3d-printed-part-space-creat

SpaceX "3D Prints" their merlin engine chambers from the same alloy, inconel. http://www.spacex.com/news/2014/07/31/spacex-launches-3d-printed-part-space-creates-printed-engine-chamber-crewed http://www.spacex.com/news/2014/07/31/spacex-launches-3d-pri...