[knowaveragejoe]

I'd love to see some 'advanced polymers' that can handle the stress of a caliber greater than .22LR(which is what Defense Distributed tested with), while simultaneously being printed with the precision necessary from a printer costing <$10k.

It's also worth pointing out you can already buy all of the components necessary to assemble your own firearm, all without a serial number. I think the deeper issue here is, as another comment pointed out, there are entrenched interests promoting this hysteria to garner public sentiment for regulation by making the scary applications glaringly obvious and overshadowing the beneficial implications of the technology.

[damoncali]

It's also worth pointing out you can already buy all of the components necessary to assemble your own firearm, all without a serial number

Not exactly true. Every legal gun has one part with a serial number that defines the gun legally. Usually (always?) it's the receiver. There are some grey areas where you can get an almost finished receiver free of regulation.

[armored_mammal]

The comment was referencing the fact that you can make a gun for yourself without a serial number as long as you don't sell it or do anything with it that is defined as 'transfer.'