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"How do you weaponize a 3-D printer?" Singer asked during a panel on the technology of war at the Aspen Ideas Festival. The ability to produce custom parts is a game-changer for scientists and hobbyists alike, but gangs, for example, have used these tools too, he explains in this short interview. Innovations in robotics and cyber warfare will also play an increasing role in conflicts around the world. Singer is the director of the 21st Century Defense Initiative at Brookings and the author of Wired for War. This video is part of a series on the Atlantic Video channel, The Future of X, looking at what's on the horizon for culture, technology, business, and politics.