I have performed several slice/slice/erase/union operations, or copy 3D solid/subtract/union operations, but the result is not quite as expected. I have a couple of lines left over which should have disappeared upon performing the union operation. These excess lines do not form a face - just an edge where there shouldn't be one.
It would not matter if they only appered when viewing in wireframe but unfortunately they appear in other viewing modes.
Is there an easy way to remove them?
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