Continuous Composites Sues FibreSeek Over Ten Composite 3D Printing Patents

The patent dispute

Continuous Composites filed suit in US court on August 10, 2026, accusing Anisoprint S.a.r.l. and its Suzhou affiliate, which markets products under the FibreSeek brand, of infringing ten patents covering continuous fiber composite additive manufacturing.

The complaint centers on the FibreSeeker 3, a continuous fiber 3D printer that Continuous Composites says uses a co-extrusion approach falling squarely within the scope of its patented CF3D technology. The company claims it spent three years trying to resolve the dispute through licensing talks before turning to litigation.

Steve Starner, CEO of Continuous Composites, said the lawsuit covers foundational technologies developed over more than a decade. The company holds over 120 US patents and more than 40 international patents in the space. It previously settled a similar case against MarkForged for tens of millions of dollars in 2022.

FibreSeek has not publicly commented on the allegations. The case will move through the US court system, and it could take months or years to resolve. For now, the FibreSeeker 3 remains available, though the lawsuit casts uncertainty over its future.