Even if it was in good faith: 3D printed guns are not a problem. They are going to jam up very quickly due to softening and melting, if not just explode all together.

It would be easier, faster, and more effective to build a gun from things sourced at the local hardware store.

But also, even then. If someone is going to commit a crime with a gun they are unlikely to build it themselves. Most guns used in crimes are actually legally purchased, purchased at a gunshow, or purchased on the black market.

Anyone 3D printing a gun is doing it as a novelty. Because of that I don’t see this as a second amendment violation. This is blantantly a first and fourth violation.