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STLRepair is an online STL repair tool for makers and 3D printing users. Upload a binary or ASCII STL to preview the model and check open boundaries, non-manifold edges, and invalid triangles. Apply supported basic repairs locally in your browser and download the result without an account. For eligible complex issues, optional cloud-based advanced repair provides a quality report, with a $3.99 one-time payment for an accepted result. Pro adds automated batches of up to five STL files.
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I built STLRepair because fixing a small STL mesh issue should not always mean installing a full modeling app. The free workflow lets you inspect the file, try supported basic repairs, and download the result without signing up. More difficult models can use optional advanced processing, with payment only for an accepted result. If you find a mesh that the tool cannot handle, I would genuinely appreciate hearing what went wrong so I can improve it.
