From my experience, and the education I've taken from experts in the field, we've learned that very basic 3-D printers—as I said, I think there's one on the market for about $299—that are commonly available at regular stores, once loaded up with a certain type of filament, a certain type of plastic that goes in them, can produce a very durable, highly functioning firearm.
On February 10th, 2022. See this statement in context.