Repair mesh
A full pre-print checkup: duplicate vertices, holes, loose shells, degenerate triangles and face orientation — with automatic repair of whatever is fixable.
A full pre-print checkup: duplicate vertices, holes, loose shells, degenerate triangles and face orientation — with automatic repair of whatever is fixable.
That STL your slicer flags in red or prints with weird gaps.
A concrete list of defects found: how many duplicates, holes and shells.
One click applies every fix and you download a closed, print-ready mesh.
Duplicate vertices, small and medium holes, degenerate triangles, flipped normals and loose fragments. Huge holes or complex self-intersecting geometry may need an editor like Blender.
Viewers will render any triangle soup, but a slicer needs a closed, consistently oriented surface to compute what's inside. Defects invisible to the eye — flipped normals, unmatched edges — break that computation.
Minimally: welding duplicates and closing small holes doesn't alter visible geometry. The one notable change is that UVs (texture coordinates) are dropped — irrelevant for printing.
A shell is a connected piece of the mesh. Scans often carry microscopic floating fragments that confuse slicers; only fragments orders of magnitude smaller than the main part are removed.