In a letter to Creality, D.A. Bragg called on the company to install in its printers an available 3D-printing software program which detects the shapes of common gun parts and blocks their printing.

The letter comes following yesterday’s U.S. Supreme Court decision upholding federal regulations requiring ghost gun parts to have serial numbers and compelling background checks for prospective buyers of ghost gun home-assembly kits.

D.A. Bragg also called on the company to remove online blueprints, also known as CAD files, from its cloud platform. The blueprints can be used to print firearms and gun parts without a background check. D.A. Bragg also called on Creality to ban the creation of illicit weapons in its company’s user agreement.