The People of the State of California, acting through Damon M. Brown, County Counsel for the County of San Diego, have sued 3D-printer filament maker Polymaker LLC. The complaint, dated October 5, 2026, and filed in San Diego Superior Court, treats selected Polymaker plastics as “firearm precursor parts.” According to the complaint, the company allegedly markets them to become the frame or receiver of a working gun. Those guns are what the filing calls “ghost guns”: unserialized firearms made outside the licensed manufacturing system.
Giffords Law Center to Prevent Gun Violence is on the pleadings, along with White & Case LLP. Giffords is co-counsel, not the plaintiff. The named defendant is Polymaker LLC, a Delaware company with its principal place of business in Missouri City, Texas, plus 50 unnamed Does. The single cause of action is California’s Unfair Competition Law, Business and Professions Code § 17200, brought under the unlawful and unfair prongs. The complaint says it is not an attempt to ban filament in California, and it concedes that 3D-printing plastic has lawful uses.
The plaintiff’s theory is narrower and more aggressive: if a company designs and markets filament for what California considers illegal gun making, that marketing turns the spool into a regulated precursor part. Even if the company doesn’t directly advertise to the gun CAD community.
California law requires commercially sold firearms to carry a serial number and to clear a background check. Precursor-part rules extend that scheme to items “marketed or sold to the public to become or be used as the frame or receiver of a functional firearm.” The complaint points to the California Department of Justice’s Firearm Precursor Part Identification Guidebook and argues that the definition can reach raw material, not just unfinished metal frames. From there, County Counsel says Polymaker’s sale of non-federally regulated precursor parts violates Business and Professions Code § 22949.62 and Penal Code § 30400.
The filing stacks two newer statutes on top of that theory. It accuses Polymaker of knowingly aiding unlawful manufacture under Civil Code § 3273.625 and Penal Code § 29186. That facilitation ban took effect January 1, 2026, and expressly covers manufacture with a three-dimensional printer by someone who is not licensed to manufacture firearms in California.
The complaint also says Polymaker is a “firearm industry member” that failed the “reasonable controls” duty in Civil Code §§ 3273.50 through 3273.51, the state’s industry-conduct statute.
Under that theory, the company had to keep its products from people it had reason to believe would use them unlawfully under California law. County Counsel says Polymaker did the opposite and cultivated that market.
The local hook is a May 2026 San Diego police case. A 16-year-old was arrested on a school campus with a concealed gun. A search connected to that arrest allegedly turned up four 3D-printed handgun frames, 3D-printed machine-gun conversion devices, more than 100 rounds of ammunition, a 3D printer, and Polymaker filament. The complaint uses that recovery to argue concrete harm in San Diego County.
It also recites a statewide statistic: ghost guns recovered in connection with suspected criminal activity in California rose from 26 in 2015 to 12,894 in 2022. Those figures mix commercially sourced unfinished frames with printed guns. The filing treats printed guns as the next wave after California moved against kit guns.
Polymaker is a known name in the do-it-yourself gun-making community because its filament is regarded as consistent and strong enough for printed frames, and because it is easy to buy, including through Amazon with Prime delivery.
The complaint does not rest on availability alone. It alleges an intentional marketing strategy. That includes affiliate partnerships in which influencers earn commissions for sending followers to Polymaker products, paid relationships with creators who distribute digital firearm manufacturing code, website ads for HT-PLA Pro and Fiberon PA612-CF15 that show printed guns or gun parts, a company wiki recommending adhesive for bonding printed firearm components to metal, and replies on gun-making forums recommending specific Polymaker products for “building guns.”
Jurisdiction is pinned to California sales, Proposition 65 and California Consumer Privacy Act pages, and imports through the Long Beach and Los Angeles ports, which the complaint says account for about 34 percent of Polymaker’s imports.
Gun-Printing Creators Become Evidence Against Polymaker
The centerpiece of the filing is Sean Aranda, who posts as “3D Print General.” The complaint says Polymaker collaborated with him on a creator spool in flat dark earth, a color associated with “military firearms,” with firearm-themed branding, and later made him Head of Customer Experience. It also says the company stepped in to sponsor his channel after demonetization because it wanted access to his audience. Aranda does print firearms, but his channel is not limited to guns. County Counsel treats the hire itself as evidence that Polymaker knew how its filament was being used and chose to profit from it.
Two other names appear in the filing. The complaint says the Aranda hire prompted leading influencer Print Shoot Repeat to comment on Polymaker’s push into that market. It also discusses CTRL+Pew, the online alias tied to CTRLPew LLC and Alexander Holladay, as a defendant in a separate California case over distribution of digital firearm manufacturing code, alongside the Gatalog Foundation. The Polymaker complaint uses that case to argue that the company partnered with people the state already accuses of supplying the code needed to print guns.
Read as a whole, the suit is aimed less at a spool of plastic than at the commercial relationship between a mainstream filament brand and gun-printing creators.
An injunction and a per-day penalty theory would pressure Polymaker to drop firearm-themed marketing, end affiliate deals with those creators, and distance itself from employees and promoters who talk about printed guns. Giffords has worked with cities and states around the country on efforts that, in practice, deplatform firearms content. This case fits that pattern: use state consumer and gun statutes to make a supplier legally radioactive to the audience that buys its product.
The prayer for relief asks the court to order disgorgement of revenue from the alleged practices and civil penalties of up to $2,500 for each violation of § 17200. County Counsel wants each day of gun-oriented marketing that California audiences can reach counted as its own violation. The complaint also seeks injunctions against the alleged unlawful and unfair conduct, attorney’s fees, and costs. Filing fees are waived under Government Code § 6103.
About John Crump
Mr. Crump is an NRA instructor and constitutional activist with more than 26 years of experience in networking and cybersecurity for major Fortune 100 companies. John has written about firearms, the Constitution, and cybersecurity, and has interviewed people from all walks of life. John lives in Northern Virginia with his wife and sons. Follow him on X at @right2bear, or at www.crumpy.com.
