The thing is, 3D printing is only really getting its legs under it.

I agree. But the future is uncertain. 3D printing might revolutionize DIY manufacturing or it might not. I am aware that some people are pretty sure it will, but their arguments tend to lean in the "because we want it to happen" direction.

A simple welding setup will give me a much more useful DIY capability than a 3D printer at the moment. And I will be able to produce a variety of home items out of scrap steel quite cheaply. Still, home welding isn't particularly popular.