Here is a list of 3-D printed firearms and firearm parts I came across. It seems that the possibility of printing your own has largely dropped off the radar. I wonder if the antis realized that 3-D guns aren't a thing yet, there are higher profile issues to pursue, or if with the increase capability of technology, the prospect of 3-D guns was something that would need to be attacked from a "non-gun" angle?

Submitted for your entertainment:

List of 3D printed weapons and parts - Wikipedia

The entry was edited fairly recently. I am impressed with the level of innovation that has been made in the last few years. I also appreciate the sense of humor some of the designers show in naming their guns.