Requiring three-dimensional printers be equipped with certain blocking technologies.

HB 2321 requires 3D printer manufacturers and sellers in Washington state to equip all new printers with software that automatically blocks print jobs for firearms or illegal firearm parts, effective July 1, 2027. The law mandates that printers use a "firearms blueprint detection algorithm" to identify and reject files containing firearm designs before printing, meeting specific technical standards to prevent bypassing. Manufacturers must attest under penalty of perjury that their printers comply, with penalties including misdemeanors for first offenses and class C felonies for repeat violations or corporate breaches. This directly affects 3D printer companies operating in Washington, aiming to prevent unlawful firearm manufacturing through technical safeguards.