That is to be expected. If there was zero gap you really would never be able to get it off. There has to be a little room, so it can be installed without having to use a soft hammer to tap it into place.Unfortunately there is a small gap where particles of dust can get in, but you can get rid of the dust with compress air. When I try to blow the dust away with my mouth I can get rid of the small strands of lint. I really don't notice the dust that much during normal wear unless I really focus on it. I am a little ocd about dust and stuff on my screen but I can live with the dust on the edge as long as there's none underneath in direct view of the face.
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