Shooting a 3D Printed Gun

While in Tucson, AZ to deliver the keynote speech at the Additive Manufacturing Users Group, Doc North meets Eric Mutchler of Solid Concepts, who took it upon himself to make a fully-operational, fully 3D-printed .45 caliber pistol. North explores the science of laser sintering and shoots the guy for himself. Is this a valid way to prove the concept of what the technology can create, or is it a somewhat dangerous use of the tech? Is it a PR stunt, or ill-advised PR error? In The Making takes you behind th