Why Should We Care About 3-D Gun Printing? – It seems anytime a new firearm technology hits the market, certain people line up with a host of terrifying reasons to ban it. Remember when Sen. Chuck Schumer D-N.Y. suggested a ban on the importation of Glocks because they’d slip through metal detectors? Obviously that’s not true, given the Glock’s metal springs, firing pin, steel slide and barrel. However, using similar logic, Schumer has found a new, recently invented target—3-D-printed guns.