WASHINGTON - Twenty minutes into his State of the Union address last week, President Barack Obama entered the realm of uber-geekery - three-dimensional printing. The magical devices capable of printing prosthetics, violins and even aircraft parts have the potential, the president said, "to revolutionize the way we make almost everything."
Forty miles away from the Capitol, in Glen Burnie, Md., Travis Lerol is proving Obama's point - with guns.
In a spare bedroom, where an AR-15 rifle leans against the wall, Lerol is using a 3-D printer no larger than an espresso machine to make plastic rifle parts and ammunition magazines in between tea sets and chess pieces. The parts print, layer over layer, creating objects like an ink-jet printer etches words.
The 30-year-old software engineer said he has no plans to print anything outlawed by the government. But like many other gun owners, he is nervous that the push for gun control in the wake of the Sandy Hook Elementary School massacre will infringe on his Second Amendment rights.
Three-dimensional printers offer a potentially easy way around restrictions and registrations - a source of growing consternation among gun-control advocates and some allies in Congress.
"There's really no one controlling what you do in your own home," Lerol said.
Although printing guns is a craft still in its infancy - Lerol hasn't tested his parts yet at a gun range - technology experts, gun rights proponents and gun safety advocates say the specter of printable firearms and ammunition magazines poses a challenge for Obama and lawmakers as they craft sweeping gun-control legislation.
One controversial idea, pushed by Sen. Dianne Feinstein, D-Calif., is to outlaw high-capacity magazines. But some proponents of 3-D printed guns have already made high-grade plastic replicas.
"Obviously, that has to be one of her nightmares," said Larry Pratt, executive director of Gun Owners of America, a lobbying group opposed to additional restrictions. "If her ban was to pass and this technology moves beyond its infancy, Dianne Feinstein is going to have a bit of a challenge."
Feinstein's proposed legislation, which would also ban AR-15s, restricts manufacturing of such items by anyone in the country, said a spokesman for the senator.
But experts on 3-D printing say that logic is dated and misses the point of the technology. Making guns for personal use has been legal for decades, but doing so has required machining know-how and a variety of parts. With 3-D printers, users download blueprints from the Internet, feed them into the machine, wait several hours and, voila.
"Restrictions are difficult to enforce in a world where anybody can make anything," said Hod Lipson, a 3-D printing expert at Cornell University and co-author of the new book, "Fabricated: The New World of 3D Printing." "Talking about old-fashioned control will be very ineffective."
It is unclear how many people are trying to print their own gun parts and magazines. But Cody Wilson, a University of Texas law student who is leading the ideological and technical campaign for 3-D printed guns through an organization called Defense Distributed, said blueprints have been downloaded hundreds of thousands of times from his group's website.
"People all over the world are downloading this stuff all the time - way more people than actually have 3-D printers," he said. "This is hot stuff on the Internet now."
Wilson and a friend founded Defense Distributed last February while looking for a "post-political" project to challenge governmental scrutiny and regulations. He speaks of "prohibitionist regimes" and anarchistic urges and challenging "democratic control." Although he shot guns as a Boy Scout, Wilson doesn't consider himself a gun person. He doesn't consider himself a tech geek either. His motivations, he said, are ideological and go way beyond the Second Amendment.
"This is a symbolic challenge to a system that says we can see everything, regulate everything," he said. "I say, 'Oh really?' My challenge is: Regulate this. I hope with that challenge we create such an insurmountable problem that the mere effort of trying to regulate this explodes any regulatory regime."
Wilson's group has posted several videos to YouTube of AR-15s firing rounds with 3-D printed high-capacity magazines and lower receivers, the part that includes the firing mechanism and is the only regulated portion of the gun if it's bought over the counter. Wilson's parts are made from high-grade polymer and retrofitted to the bodies of existing weapons. The receivers are made able to fire by adding over-the-counter springs, pins and a trigger.
In one recent video, Wilson fires dozens of rounds from an M-16 using a 3-D printed high-capacity magazine. "How's that national conversation going?" he asks.
Defense Distributed also runs a website called Defcad, where anyone can download gun designs and trade tips. The other day, a user posted this question to a discussion board on the site: "I know nothing of 3d printers. I can tell there are a few different types of materials to print and some appear to be easier to break than others. What printer and material is the best for printing a receiver and mags?"