Legislation proposed in New York would require certain consumer and small-business 3D printers to include built-in technology designed to prevent the printing of gun parts, according to multiple reports. The proposal targets the growing ability of individuals to produce untraceable firearms, often referred to as “ghost guns,” using files and methods that can bypass traditional supply and serial-numbering practices. Under the plan, printers sold for home and business use would have to be equipped with features intended to stop users from creating components that can be assembled into functional weapons. Similar requirements are described as under consideration in California, suggesting the issue is being addressed across more than one major U.S. state. Coverage also notes that questions remain around how such restrictions would work in practice, including how the technology would be implemented and what it would mean for legitimate, non-weapon uses of 3D printing. The proposals are framed as a response to firearm-related incidents involving parts produced through recent advances in home fabrication.