3D Printed guns have been all over the news the last few months, especially yesterday when a metal sintering printer created the world's first 3D printed Metal gun. Well, the city council in Philadelphia have proposed a law to outlaw the 3D printing of any guns. The the city of Philadelphia passes such a law, they will be the first major city to do such a thing.

More details here:
http://www.3ders.org/articles/201311...ladelphia.html