Lawmakers are trying to prevent the spread of 3-D-printed guns. They may be too late.

Lawmakers are trying to prevent the spread of 3-D-printed guns. They may be too late.  Washington Post Gun control advocates can't stop group from posting instructions to 3-D print a gun  CNN Judge blocks gun control groups' lawsuit to stop downloadable 3D-printed guns  The Hill Don't flood this country with 3D-printed guns  Charlotte ObserverFull coverage