Politicians are calling for regulation on 3-D printers following the printing of what deadly weapon?

Answer: guns

After several reports and videos online of amateur 3-D printing enthusiasts making their own functional firearms using 3-D printers, at least one legislator has called for regulation. Sen. Leland Yee, D-California, admitted the technology was impressive, but also cited the technology as a possible terrorist threat.

Photo via 3ders.org