The Stratasys v. Bambu Lab Patent Lawsuit: USPTO Win, European Loss

In August 2024, Stratasys sued Bambu Lab for patent infringement in the U.S. District Court for the Eastern District of Texas, alleging that six of the Chinese company’s most popular desktop 3D printers infringe ten Stratasys patents covering features now standard across the consumer market, including heated build platforms and purge towers. The Stratasys Bambu Lab patent lawsuit has since expanded into a consolidated U.S. proceeding, a failed European injunction bid, and a patent office challenge that Bambu Lab lost. As of mid-2026, no trial date has been set.

Who Is Suing Whom

Stratasys is an established additive manufacturing company headquartered in Eden Prairie, Minnesota, and Rehovot, Israel. It holds over 500 granted or pending patents globally and is credited with commercializing fused deposition modeling, the technology behind most consumer 3D printers. Stratasys acquired MakerBot in 2013 for roughly $403 million, deepening its portfolio in desktop printing.¹

Bambu Lab was founded by former DJI engineers, including Tao Ye and members of DJI’s core R&D team. It reported approximately 6 billion RMB in revenue in 2024, shipped roughly 1.2 million units, and captured an estimated 29% share of the global consumer-grade 3D printer market. Despite frequent characterization as a “DJI-affiliated startup,” there is no confirmed direct financial backing from DJI; the connection runs through the founding team’s background rather than corporate ownership.²

The suit named several affiliated entities as defendants: Shenzhen Tuozhu Technology Co., Ltd. (the parent), Shanghai Lunkuo Technology Co., Ltd., Bambulab Limited, Tuozhu Technology Limited, Beijing Tiertime Technology Co., Ltd., and Beijing Yinhua Laser Rapid Prototyping and Mould Technology Co., Ltd.³ In October 2025, Stratasys dropped its claims against Tiertime and Yinhua without prejudice.⁴

What Stratasys Is Accusing Bambu Lab Of

Stratasys asserts ten patents in the lawsuit. Two are the anchors of the case, because they cover features found on nearly every consumer 3D printer sold today.

The first is US9592660B2, which covers a heated build platform and system for three-dimensional printing. A heated bed reduces warping and defects during printing, and it is standard on nearly all consumer machines.⁵

The second is US9421713B2, which covers a method for printing three-dimensional parts with purge towers. Purge towers manage material transitions during multi-color and multi-material printing and have become standard in the latest generation of desktop systems. Stratasys does not itself use purge towers in its commercial material extrusion machines, relying instead on dual extrusion or internal material management.⁵

The remaining eight patents span extrusion-based deposition methods (US7555357B2), force detection in 3D printers (US9168698B2 and US10556381B2), tagged build material (US10569466B2 and US11167464B2), networked printing with a 3D scanner (US8747097B2), detection and use of printer configuration information (US11886774B2), and networked three-dimensional printing (US8562324B2).⁵

Six Bambu Lab printers are accused: the X1C, X1E, P1S, P1P, A1, and A1 mini. Stratasys is seeking a jury trial, financial damages, and an injunction barring Bambu Lab from selling the accused printers.⁶

Where the U.S. Case Stands

Stratasys sent a notice letter to the defendants on August 5, 2024, and filed two complaints in the Eastern District of Texas on August 8, 2024, drawing case numbers 2:24-CV-00644-JRG and 2:24-CV-00645-JRG. The cases were assigned to U.S. District Judge Rodney Gilstrap.⁷

In December 2024, Bambu Lab pushed back. Five Bambu Lab entities filed a declaratory judgment action for non-infringement in the Western District of Texas. Stratasys answered with counterclaims in February 2025, and Bambu Lab filed its own counterclaims in March 2025. Judge Alan Albright transferred the declaratory action to the Eastern District of Texas in May 2025, and it was reopened as case number 2:25-cv-00465.⁸

Bambu Lab moved to dismiss Stratasys’s lawsuit on the ground that its U.S. subsidiary, BambuLab USA, had not been named as a defendant. On May 29, 2025, Judge Gilstrap denied the motion, ruling that the named defendants were the proper targets, that Bambu Lab and BambuLab USA are both owned by Shenzhen Tuozhu and their interests are aligned, and that any potential risk to the U.S. subsidiary was “too vague or hypothetical to justify making it a required party.” He called Bambu Lab’s argument “unavailing.”⁶

By mid-2026, the parties agreed to consolidate the cases under number 2:25-cv-00465-JRG. On June 2, 2026, the court ordered Bambu Lab to confirm its consent in writing; Bambu Lab did so on June 12, 2026, waiving its rights under 35 U.S.C. § 299(a). The court was preparing to finalize the merger of the cases at the time of the most recent reporting.⁶

The Purge Tower Patent Survived a USPTO Challenge

Bambu Lab tried to knock out the purge tower patent outside of court. It filed an inter partes review at the U.S. Patent and Trademark Office, IPR2025-00321, arguing that the patented process had been used previously by other parties. The USPTO denied the challenge, ruling that Bambu Lab failed to prove by a preponderance of the evidence that the relevant claims are unpatentable. US9421713B2 remains valid, which leaves one of Stratasys’s two anchor patents intact heading into the merits phase.⁹

The European Ruling Went the Other Way

Stratasys filed an application for provisional measures — the European equivalent of a preliminary injunction — with the Unified Patent Court in The Hague on January 28, 2026. It targeted Bambu Lab’s H2C 3D printer and alleged infringement of European Patent EP 2,964,450, which covers the use of purge towers (called “prime towers” in the European filing). Stratasys sought an immediately enforceable injunction across France, Germany, and the Netherlands.¹⁰

On April 24, 2026, the court dismissed the application. The decision turned on how the claim language “in a layer by layer manner” should be read. The court sided with Bambu Lab, holding that the patent requires each horizontal layer of the purge tower to consist of only one type of material. Because the H2C builds layers that contain different materials side by side in the same plane, the court found it “more likely than not that the patent is not infringed.” The court did not reach patent validity or urgency. A separate revocation action filed by Bambu Lab against the same European patent is pending at the UPC’s Paris Central Division.¹⁰

The European result is a win for Bambu Lab, but a narrow one. It applies only to the European patent and only to the H2C model. The U.S. case involves a different patent (US9421713B2) with its own claim language, and that patent survived Bambu Lab’s IPR challenge, so the Hague ruling does not control the American case.

What Is at Stake

Because the two anchor patents cover technology used across the consumer market, a Stratasys win on the broadest claims could reach far beyond Bambu Lab. Every consumer 3D printer maker relying on heated beds or purge towers could face licensing demands. Industry analysts have estimated a successful outcome could net Stratasys licensing royalties upward of $15 million over five years as a low-end figure, though any recovery would be years away given typical patent litigation timelines.⁵

Stratasys’s legal spending has climbed alongside the case. The company recorded $10.36 million in legal and other expenses in Q1 2026, up from $1.82 million in Q1 2025. Stratasys has described infringement of its intellectual property as a material business risk in its SEC filings.¹¹

Patent litigator Alan Laquer said he believes Stratasys is most likely pursuing a settlement, calling the chance of a trial “slim.” Fewer than 3% of the more than 2,200 patent cases overseen by Judge Gilstrap over the previous five years have gone to trial. Dr. Joshua Pearce of Western University said “no one is going to win,” arguing that a Stratasys victory would slow innovation and raise consumer costs. Patent attorney Andrew Spitzer said the case could cause a “seismic shift in the 3D printing landscape,” potentially positioning Stratasys as a gatekeeper through licensing control.⁴

Whether Bambu Lab redesigns around the asserted patents, negotiates a license, or fights through to a verdict will depend on how the merits phase develops. The case, still in its earlier stages with no trial date set, is the one to watch for anyone who buys, sells, or builds a desktop 3D printer.

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