An interesting little segment from the US Public Broadcaster PBS. If nothing else, check out the name of their Science correspondent who ends up telling us about 3D printing of rocket engines!
Another point of interest is where 3D print manufacture allows parts unable to be manufactured by other methods, which also allows parts designed entirely by computers which do stress analysis during the design leaving no stress hot-spots in the part. This results in organic ‘tree root like’ components which also provides some Sci Fi fans with retrospective rationale for organic-looking space ships a-la HR Geiger Alien designs (I guess).
Random item from my Tabletop Games Collection
See it & the rest here: