Could 3D printing put an arsenal at your fingertips?

01/2/2013 | Popular Science

Three-dimensional printing passed from high-tech novelty to emerging reality in 2012, but the prospect of creating any object you want without any oversight poses a range of ethical and legal dilemmas. As this photo slideshow illustrates, enterprising hobbyists spent the past year designing and printing various complex and potentially deadly objects, including plastic "brass knuckles," firearms and a key that can open handcuffs.

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