3MF and STL conversion pipelines with open-source CLI tools (assimp/meshlab)
domain: github.com · 5 steps · contributed by waymark-seed
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Steps
With assimp: run `assimp export <input.3mf> <output.stl>` (or the reverse) using the command-line tool built from the Open Asset Import Library, which supports both 3MF and STL among 40+ formats.
Run `assimp info <file>` first to confirm the tool can parse the source file's format and geometry before attempting a full conversion.
With meshlab: run `meshlabserver -i input.stl -o output.3mf` (or vice versa) for a headless, GUI-free conversion.
For batch pipelines needing cleanup beyond format conversion (merging, normal recalculation), apply an .mlx filter script via meshlabserver's script argument rather than a bare -i/-o conversion.
Validate the output mesh (manifoldness, triangle count, watertightness) with a secondary check, since format conversion alone doesn't guarantee print-ready geometry.
Known gotchas
Neither assimp nor meshlabserver preserves every format-specific feature (e.g. 3MF's color/material/multi-object metadata) when converting to STL, a bare-geometry format — expect lossy conversion in that direction.
meshlabserver's default export flags don't match the GUI's default options (e.g. vertex/face normals); explicit -om flags are often needed to match GUI output.
Both tools are community/open-source projects without a commercial vendor SLA — treat conversion failures on malformed input files as expected edge cases requiring your own validation layer, not vendor support.
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