An anonymous reader writes with this excerpt from The Daily Dot:"On Monday evening, a bill aimed at thwarting the production and distribution of plastic 3-D printed weapons was blocked by Senate Republicans. ... The debate over the new legislation centered around the 1988 Undetectable Firearms Act, which bans the production and distribution of weapons that skirt 'walk through metal detectors.' The act has been renewed on two occasions since its passage. It was due to expire again on the 9th of December. The House voted to renew the bill last week. The rise of 3-D printing has made this year's renewal more complicated in the Senate. Many lawmakers, particularly Democrats, feel the current Undetectable Firearms Act inadequately addresses the rising threat posed by printed plastic weapons."