Degenerate faces are triangles which have no surface or only minimal surface. In the repair screen, they are marked orange. As they do not construct any surface, they usually are unnecessary. They can come into being during various operations, such as file conversion, Boolean Operations and all kinds of operations which involve retriangulations. Degenerate faces in a file principally do not result in bad parts when manufactured, but they may dramatically increase the number of corner points and hatches in the slice files necessary for the production. This may cause much longer calculation and production times.
Degenerate faces are triangles which have no surface or only minimal surface. In the repair screen, they are marked orange. As they do not contribute to the surface, they usually are unnecessary. They can come into being during various operations, such as file conversion, Boolean Operations and all kinds of operations which involve new triangulation. Degenerate faces do not necessarily result in bad parts when manufactured, but they may dramatically increase the number of corner points and hatches in the slice files necessary for production. This may cause much longer calculation and production times
With this action, the degenerate triangles are deleted. By setting the tolerance, you can set the maximum edge length and height of the triangles to be deleted.

The orange-marked triangle has no and consequently looks like a one-dimensional line.