The fact that the federal government is unwilling to restrict guns and other real causes of ongoing public health crises (such as massive passenger cars and trucks) even as the deaths pile up does not mean that any level of government should be piling onerous regulations onto other things that demonstrably cause essentially zero harm at the macro scale, such as 3D printers, non-commercial/non-military UAVs, and so on.

If the number of people killing themselves with 3D printed guns is not literally zero or vanishingly small at most, I would be very surprised.