What a silly thing to be freaking out about...
3D printed firearms are a novelty. Unless you decide to invest 100's of thousands of $ on a sintering printer, whatever you produce will be pretty sketchy. Maybe with barrel liners etc, and some of the modern plastics you could make something reasonably functional, but still..
Compare that you anyone who has a metal lathe and some basic tooling, and you have the ability to manufacture something that is far more practical.
Stuff like zip guns or home-made shotguns are ridiculously easy to make.
Do even a cursory search on youtube, and you will learn how to make rifled barrels with very simple tools...
The entire thing is a non-issue.
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