STLRepair

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.