Background
Stratasys Inc., the U.S.-Israeli 3D-printing pioneer and holder of many foundational additive manufacturing patents, launched a multi-front patent war against Chinese competitor Bambu Lab and its parent Shenzhen Tuozhu Technology beginning in 2023. The dispute spans district court litigation in the Eastern District of Texas and PTAB inter partes reviews targeting key Stratasys patents.
Two PTAB trials reached their final written decision stage in June 2026, covering two contested Stratasys patents:
- U.S. Patent No. 8,562,324 — directed to networked 3D printing systems (IPR2025-00311, petitioned by Shenzhen Tuozhu)
- U.S. Patent No. 9,421,713 — directed to “purge tower” technology used during multi-material printing (IPR2025-00321)
The Court’s Holding
The PTAB issued split decisions on June 10, 2026. In IPR2025-00321, the Board invalidated claims of the ‘713 patent covering Stratasys’s purge tower technology, finding those claims anticipated by or obvious over cited prior art references. In IPR2025-00311, the Board largely upheld claims of the ‘324 patent covering networked 3D printing, finding Shenzhen Tuozhu’s prior art arguments insufficient to overcome Stratasys’s evidence of patentability.
The net effect is a partial setback for Stratasys’s portfolio: it loses patent coverage on certain multi-material printing techniques while retaining core networked-printing claims. Meanwhile, the parallel Texas district court litigation — with trial dates scheduled later in 2026 — continues.
Key Takeaways
- PTAB petitioners in patent disputes between technology competitors should expect mixed outcomes when challenging multi-patent portfolios: some patents are more vulnerable to prior art than others, and a single IPR petition does not necessarily doom all asserted claims.
- Stratasys’s foundational networked-printing patents survived PTAB review, preserving a meaningful litigation position in the Texas district court case.
- The purge-tower patent loss is significant because multi-material printing — where Bambu Lab’s products have found strong market reception — is central to the commercial dispute between the parties.
- Chinese 3D-printing companies are increasingly mounting sophisticated IPR challenges in U.S. proceedings rather than simply relying on district court defenses — a shift that reflects the growing sophistication of Chinese technology litigation strategy.
Why It Matters
The Stratasys-Bambu Lab dispute is one of the most closely watched patent battles in the additive manufacturing industry. Bambu Lab’s affordable, high-speed consumer printers have disrupted the market that Stratasys and its subsidiaries long dominated, and Stratasys has responded with aggressive litigation to protect its IP position. The PTAB’s mixed ruling keeps the dispute alive on multiple fronts: Bambu Lab gains freedom to operate on the purge-tower patent, but Stratasys’s networked-printing protection remains, giving it continued leverage in Texas.
For the broader 3D-printing community — including desktop printer users and small manufacturers who depend on Bambu Lab’s ecosystem — the ruling means continued litigation uncertainty. Until the Texas district court trial concludes, neither side has a definitive victory, and the IP landscape for multi-material FDM printing remains contested.
Full Opinion
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