Via email from Rolf:

All gun control is stupid as a means to reduce violent crime and unconstitutional. Banning 3D printed guns is extra stupid.

Never forget:

One thing that humbles me deeply is to see that human genius has its limits while human stupidity does not.

Alexandre Dumas
Circa 1865, Grand Dictionnaire Universel du XIXe Siècle: Français, Historique, Géographique, Mythologique, Bibliographique, etcetera, Volume 2, Entry: Bêtise, Quote Page 650, Column 1, Published by Pierre Larousse, Paris. (Google Books Full View)