There are lots of techniques now. I know in some aerospace projects they lay down metal directly a bit like welding. Getting the design right really matters, but some software can analyse for strength. Having this sort of thing at home was the stuff of dreams when I was a kid. It has gone from being a DIY geek thing to an appliance in the last few years.
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3D printing exists for a very long time. Was hyped like 10-12 years ago or something? At least what that hype caused was the design of smaller, low-cost printers for use at home and (small) design offices. I suppose this also driven more accessible software. Must admit, didn't look into this segment for the last so many years. Back then I tried all sort of design software, including Maya, Rhino and Blender. These days Maya is owned by Autodesk as far as I know. But also sculpting software. Even talked with Uform (https://uform.co/) to get something of the ground together in the B2C space. This was back in 2014/15/16. Eventually, I shelved the idea/concept/project, but still sometimes think: "What if I pulled through back then?" I know part of the answer: Challenging, since it was in effect too early for a proper B2C play.