Continuous Composites Sues FibreSeek Over Continuous-Fiber Printing Patents

Continuous Composites, the Idaho-based developer of CF3D continuous-fiber 3D printing technology, has sued Anisoprint and its FibreSeek brand for patent infringement. The complaint, filed August 7 in the U.S. District Court for the District of Delaware, asserts ten patents covering the core methods of combining continuous reinforcement fibers with thermoplastic matrices during additive manufacturing.

The lawsuit specifically targets the FibreSeeker 3, a desktop continuous-fiber printer that launched through a Kickstarter campaign in late 2025. Continuous Composites claims the machine uses a co-extrusion process that falls within the scope of its patented technology. The company says it spent roughly three years trying to negotiate a licensing deal before going to court.

All ten patents in the case trace back to a single 2012 provisional application filed by CCI co-founder Kenneth Lyle Tyler. The patents describe methods for depositing continuous fiber strands alongside a polymer matrix to produce structural composite parts. Continuous Composites says its portfolio now includes more than 120 granted U.S. patents and over 40 international patents in the same space.

The complaint seeks both monetary damages and a court order blocking further sales of the FibreSeeker 3 in the United States. As of mid-August, no defendant had filed a substantive response. The case is still in its early stages, and no trial date has been set.

This is not the first time Continuous Composites has enforced its patent portfolio. The company previously sued Markforged over continuous-fiber printing technology, a dispute that contributed to Markforged's eventual sale to Stratasys earlier this year. The new lawsuit signals that CCI intends to be aggressive about protecting its intellectual property as more players enter the continuous-fiber desktop market.