“... Much of what you need is just waiting for you to place your order.”
No it isn’t.
Garth Tater has not the first idea of what he is talking about.
No one in gun manufacturing, nor in gun repair, speaks about “10x stronger than steel.” Lots of materials are “stronger” but cannot be fashioned into a gun that will fire more than one shot or have much chance of not injuring the shooter. I realize I’m on very thin ice here, but I suspect the market is not very big for guns that aren’t durable, safe, and reliable - no matter how cheap they are.
Nothing but steel - properly alloyed, carburized, and/or tempered - has to date demonstrated the requisite properties of toughness, hardness, and resistance to high-temperature erosion required in a firearm.
And the requisite levels of these properties cannot be bestowed on an accreted mass while it’s being built up. The part must be shaped first, then heat-treated and/or surface hardened.
And no firearm can be assembled from parts by the uninformed and unskilled: safety, reliability, and durability cannot be attained unless everything is properly fitted, which cannot be done in advance by any automated process. The difference in dimensions, between “won’t work” and “explodes on firing” is too small. No cutesy software-controlled workaround will do the job.
Springs cannot be built up by any 3D-print method. And no firearm can be made without them. The design details are irrelevant.