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"Or maybe give these guys a try? They will be happy to deliver 3D printed titanium parts right to your door printed directly from your supplied CAD files."

Go ahead and request a quote, Garth. Somewhere around $1000 per cubic inch plus material would be my ballpark guess, and the tolerances are not great. If you're making just 1 part, and don't need alot of precision, it might be worth it. If you're making 100 of them, you can make most of what's shown on their page of equal or better quality for a fraction of the price using casting (really old tech).

The article you linked isn't a full 3D printed gun. Only the lower receiver is 3D printed. Even those are easier to make (and far safer) using "last century" tech. You can (kind of) 3D print full "real" metal guns (not recommended). It's neither economical nor safe, and you're going to need more "last century" tech to finish them after you've rough-printed the parts. To outfit your home shop to do that would cost you a bare minimum of $150k, and could easily run upwards of $500k. Last time I checked, you could still buy a whole pile of genuine-article AR-15's for that kind of cash.

The article you linked isn't a full 3D printed gun. Only the lower receiver is 3D printed. Even those are easier to make (and far safer) using "last century" tech.

Well, that is the "gun" according to the BATF :)

That article was 3 years old. Here's a newer one you might find interesting.

How 3-D Printed Guns Evolved Into Serious Weapons in Just One Year

Go ahead and request a quote, Garth. Somewhere around $1000 per cubic inch plus material would be my ballpark guess, and the tolerances are not great. If you're making just 1 part, and don't need alot of precision, it might be worth it.

We're quibbling here and I don't like to do that, but... the original article that started this discussion was about "the future." I merely pointed out a few of the things that are ALREADY available. And if you don't like the price quoted by the company I mentioned head on down to your local MakerSpace and rent their laser sintering machine for what? Less than $100 per hour? There is more cool manufacturing tech out there right now than any one mind can get itself wrapped around. I can hardly wait to see what comes along in "the future."