Universities are being warned to monitor students with an interest in 3D printers over fears the technology is being exploited to create homemade firearms. The National Crime Agency (NCA) is telling university staff about the danger posed by printed weapons in an official bulletin that is set to be sent out this week. It is illegal to make guns, and legislation that would criminalise the sharing of 3D printer blueprints for firearms is currently making its way through Parliament. The NCA bulletin on 3D printed firearms is set to be shared with universities via the Department for Education later this week.