Re: 3D-printed aren't what you should worry about
"they can much cheaper and easily go down to their friendly neighborhood hoodrat hoodlum and buy a pistol with the serial scratched off."
Yes, in the USA "everyone knows" where to get such a gun, or they know someone who knows. If the price is cheap it means the gun has been used in a crime already. And "untraceable" is just marketing bollocks.