With the new freedom afforded by 3D Printers, people can easily make weapons at home, without taking years of training and spending thousands of dollars on machinery.
Predictably, where there is newfound freedom the Police State appears. Congressman Israel wants to ban 3D guns entirely:
"…what Rep Israel doesn't say is how he hopes to accomplish his goal. Firmware locks for 3D printers? A DMCA-like takedown regime for 3D shapefiles that can be used to generate plastic firearms (or parts of plastic firearms?). A mandate on 3D printer manufacturers to somehow magically make it impossible for their products to print out gun-parts?"
Congressman: Ban 3-D Guns