3D printer blocking laws
New York, California and Washington have passed or proposed laws that make 3D printers refuse to print guns and gun parts. Other laws cover sharing digital gun files.
What does New York's S9005-C require?
The governor signed S9005-C on 27 May 2026. Part C bans selling or delivering a 3D printer in New York without blocking technology, and the buyer and seller must meet in person. The rule starts one year after the state's Division of Criminal Justice Services sets standards.
preslice sells no printers.
What does California's AB 2047 require?
AB 2047 bans selling a 3D printer in California without "hardware, firmware, or other integrated technological measures" that block gun files. The Legislature passed it on 31 August 2026 and sent it to the governor on 14 September (status). Unless the governor vetoes it by 30 September, it becomes law (California Constitution, art. IV, sec. 10).
The rule starts one year after the Department of Justice publishes guidance, which waits on an ASTM standard. If no standard exists by 1 July 2029, the department no longer has to act.
preslice sells no printers.
What does Washington's HB 2321 propose?
HB 2321 would make printers sold in Washington block gun files in one of three ways: a check in the printer's firmware, a single approved slicer, or a handshake with approved slicers. It went to committee on 12 January 2026 and has seen no action since (status).
preslice is not a slicer. It edits the .3mf and makes no G-code.
Which laws cover sharing gun files?
| Place | Law | Status | What it covers |
|---|---|---|---|
| New York | Penal Law §265.10(11) and (12), in S9005-C | In force since August 2026 | Sharing gun files with anyone who lacks a gunsmith license and a federal gun maker's license, or holding them to make a gun illegally |
| California | Civil Code §3273.61 | In force since 1 January 2026 | Lets people sue anyone who knowingly shares gun files with unlicensed people in California |
| Washington | ESHB 2320 | Signed on 24 March 2026 | Selling or sharing gun files with unlicensed people, or holding them to make a gun |
| Colorado | HB26-1144 | In force since 1 July 2026 | Sharing gun files with unlicensed people, including over the internet |
| Canada | Criminal Code s. 102.1 | In force since 15 December 2023 | Sharing files while knowing they are for making guns illegally |
| United Kingdom | Border Security, Asylum and Immigration Act 2025, s. 53 | Passed, not yet in force | Holding or supplying 3D gun templates when serious crime is suspected |
| United States | H.R. 4143 | Introduced on 25 June 2025 | Sharing gun files over the internet |
preslice does not host, store or share model files.
What does preslice do with my file?
preslice opens the .3mf in your browser. Your model never reaches the
server: Convert sends print settings and hardware, and search sends what you
type (what leaves your browser).