Slippery slope is a fallacy, they said.
> Many places also do background and/or work eligibility checks, which again is a form of KYC.
Except that it isn't KYC at all, both because employees aren't customers (most people are the employees of one company but the customers of hundreds or more), and because the majority of people don't have that requirement imposed on them by the government. There are many jobs you can get without a background check.
Buy an 80%, machine it to finish it, and you now have a completely unregistered long rifle with no serial number, and it is completely legal.
It does actually seem like they are an issue - the technology has now been used in several high profile murders and police are reporting seizing them pretty regularly.
I don't think that justifies taking away the freedom to 3D print, but the truth is that if you're committing a crime there are a lot of advantages to a dirt-cheap untraceable nonferrous gun even if it only lasts a few shots.
Considering most places does direct deposit and that requires a bank account (so KYC), I don't see what's particularly new here. Many places also do background and/or work eligibility checks, which again is a form of KYC.
>Today, you can buy parts/print a completely untraceable firearm, so do we license sales of steel tubing and 3D printers?
Fortunately 3d printed guns are bad enough that it's not really an issue, although the bigger threat is probably CNC machines. However that's probably will get a pass, because they're eye-wateringly expensive compared to black market guns that nobody would bother.