https://solidean.com/docs/guides/one-click-mesh-repair/
1-Click Mesh Repair: Solid, Manifold, Watertight | Solidean
Turn arbitrary triangle soups into a clean, solid, manifold mesh with indexed topology (and optional half-edges).
meshrepairsolidmanifoldwatertight
https://solidean.com/
Solidean | A Boolean Revolution in Geometry Processing
Exact, robust, high-performance mesh booleans for developers building CAD, CAM, and 3D software.
booleanrevolutiongeometryprocessing