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I was wondering why I get some messed up mesh (and consequently some free faces flying around, marked in the screenshot) when I use tetra remesh to take care of tetra collapse and other element check factors. I need to mesh the transition layer you see in the attached screenshots. When I tetramesh it, it's ok and no free edges/faces. But after remeshing the tetramesh locations with problematic tetra collapse, I end up with some weird elements protruding to others and some free edges/faces that even equivalence couldn't get rid of them! Any help/idea is greatly appreciated. Also let me know if you know a better way to mesh this transition than tetramesh (the area of the inner squares are 1/4 of outer squares). Thanks a lot, Maysam