If you're looking to make a single shot type weapon from Home Depot, it's pretty easy.
3D printing with plastic is a non-starter.
2020-03-21 12:04 from IGnatius T Foobar
So where are we at this point with 3D printing of metal? That seems
like the obvious breakthrough.
Way more expensive than buying a welder, an angular grinder, a hacksaw and a bunch of standard metal pieces and building your own thing. Cheapest metal printer I have heard of is above 120k USD.
If 3D printing of metal can be made affordable -- or instead, the innovation of a thermoset polymer that cures hard and dense enough to be used in the barrel of a gun -- then it becomes possible for guns to be manufactured by non-gunsmiths. That is what makes this problem space interesting.
There's a ton going on in 3D printing of weapons. But most focus on replicating what's already polymer in off the shelf firearms.
So, you can easily buy most of the parts over the counter, and the pieces that are consdiered a "firearm" are printed. It's how 80% firearms are sold.
You need dom do 20% of the work yourself.
The barrel is the hardest part to deal with. If you search for electro-chemical machining, you will find ways of making a rifled barrel at home too.... The FGC-9 I mentioned uses this process. You can build the entire gun at home with a handful of parts from a hardware store and a 3D printer.
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