3D printers offer the promise of a world in which anyone can manufacture anything but, as with all technology, there are upsides and downsides. Last week we learned that handcuffs could be unlocked with a 3D printed key; now “HaveBlue”, a member of the AR15.com gun enthusiast forum, which is named after a common semi-automatic rifle, claims to have carried out the first successful test-firing of a 3D-printed gun.
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