[jonno]

I googled: “how strong is sintered metal”

https://www.google.com/search?q=how+strong+is+sintered+metal&ie=utf-8&oe=utf-8

Seems to me this process would work well with non-structural, non-explosion proof requirements.

[Bellflower]

Could graphene be added to the metal?
https://nggenius.com/

[kosciusko51]

FYI, from a few years ago: Piece by Piece: NASA Team Moves Closer to Building a 3-D Printed Rocket Engine.