[David]

I'm not a fan of 3D printed metal components... yet.

The 3D printed sand casting molds are really cool though. I was at a sand mold printer a couple years ago and they had a vintage Ferrari head they had just cast. The old days of having to make a wooden pattern to form the sand mold are over.

And you can and should print as many sand molds as will fit in the sand box since it's going to fill the whole box with sand anyway. So you can nest multiple projects in one printing session.