My understanding is that viable designs for 3D printed guns have been on the dark web for years.
I've downloaded some in the past. And haven't bothered printing one on my 3D printers. Not worth the effort.
With the proper tools, a machinist can produce an excellent gun. Regular 3D printers cannot. They may function, but are inferior in every way to handguns readily available everywhere. It's a non-issue regarding the security of the country.