Prusa accuses Bambu Lab of AGPL violations in BambuStudio slicer fork

Josef Prusa, founder of Prusa Research, has publicly accused Bambu Lab of violating the AGPL license terms of PrusaSlicer, the open-source slicing software that BambuStudio was forked from. The claim, raised on X, alleges ongoing non-compliance since the fork was created — the AGPL requires derivative works to release source code under the same copyleft terms, including modifications used to serve users over a network.

The dispute highlights a recurring tension in the 3D printing ecosystem, where commercial hardware vendors build proprietary tooling on top of community-maintained open-source projects. PrusaSlicer itself descends from Slic3r, and BambuStudio’s lineage ties Bambu Lab’s commercial offering directly to that AGPL-licensed codebase.

The article content itself was not accessible — the source URL points to an X post that requires JavaScript to render — so details of the specific alleged violations, the scope of unreleased modifications, and any response from Bambu Lab are not captured here. The significance lies in a major open-source maintainer publicly calling out a well-funded competitor over license compliance, a scenario that often precedes formal enforcement action.