10 Basic 3D Model Repair Functions Every Data Prepper Should Know
4. Stitch bad edges
When two or more triangles aren’t connected to each other, we refer to it as “bad edges”. In theory, bad edges can also simply be considered as gaps in the design, as the triangles that surround the gap can’t connect to an edge anymore. When your design contains bad edges, it means that you don’t have a watertight design. You need to stitch these bad edges to get a manifold, printable model.
Another variant of this phenomenon is called “near bad edges” and occurs when two triangles are close to one another, but with edges that don’t completely touch. This isn’t always visible on your screen, so it’s always best to be careful and let your STL editor indicate the errors. When you have a whole series of bad edges, it’s referred to as a “bad contour”.
The ShrinkWrap tool
For files with very bad quality, the automatic repair of flipped triangles, bad edges, holes and rough surfaces may not be sufficient. In that case, you can apply one of Materialise’s impressive fixing tools, called ShrinkWrap. This complex algorithm will place a thin layer around your model that shrinks afterwards and repairs difficult errors, while keeping details intact.