Manufacturing 3D-printed firearms, sometimes called “ghost guns,” will be illegal in Colorado under a new law signed Monday, May 4, by Gov. Jared Polis. House Bill 1144 makes 3D printing a gun or gun component a Class 1 misdemeanor for a first offense, and a Class 5 felony for multiple offenses, both of which are punishable by jail or prison time. The measure, which takes effect on July 1, exempts federally licensed firearm manufacturers and ce…