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The biggest fear of 3D printing would be allowing people to print their own 3D guns and other dangerous devices. Amateur gunsmith Michael Guslik produced the lower frame of an AR-15 and used off-the-shelf products to finish the weapon — that works.
The firearm in question is a .22-caliber rifle developed by Wisconsin engineer and amateur gunsmith Michael Guslick. Using his Stratasys 3D printing machine and blueprints downloaded from the internet, Guslick successfully printed the lower receiver — or frame — of an AR-15 rifle, and turned it into a gun.