These four original MeshRebuild teaching fixtures may be used, modified and redistributed, including in workshops and documentation. Attribution is appreciated but optional.
STL is unitless; choose millimetres for the cube's 20 mm interpretation. Intentionally broken samples are diagnostic examples, not production parts. Counts apply to MeshRebuild's exact-coordinate edge method and do not certify printability.
Expected results: https://meshrebuild.com/resources/stl-test-files