Hi,
I was wondering if there was an extension that would delete all lines (whether on a face or not) that don’t form an edge?
CleanUp³ didn’t really do the job for me. It deleted some that it considered “stray”, but not the ones that sit on a face but don’t have any further purpose.
If the edges you’re trying to eliminate are between coplanar faces, DeleteCoplanar from Smustard can handle that. If the faces are not coplanar, you’ll want to keep the edges but you might hide or soften them depending on where they are.