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He said the technology exists now for a highly motivated group to make a plastic gun on a 3-D printer that could avoid airport scanners. But the equipment is still too expensive for most people.

“Nobody right now needs to worry about the bright teenager making a gun on a printer in their bedroom,” he said.

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Freelance video producer Jay Olivier contributed to this report from Austin, Texas.

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Jason Dearen can be reached on Twitter at http://www.twitter.com/JHDearen