3D Gun Printing: The End of Gun Control in the United States?

The recent shootings at the University of California, Santa Barbara and in Las Vegas have brought about the age-old question of gun control in the United States.  While the Second Amendment of the United States Constitution has its supporters and critics, the federal government has enacted regulations intent on securing the safety of society by requiring citizens who purchase firearms to register them and hold the necessary licensure.  However, recent events are changing how we obtain weapons.  What if citizens did not need a license to purchase a firearm at a store, but could instead acquire them with just a computer, a block of plastic, and a 3D printer?