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Hi, looking for some help. So I printed 15 tiles, 5 of which have these horizontal black marks on them that almost looks like stitches. They are in roughly the same position on each tile. I am not totally sure if it was 5 in a row that came out like this or not, I do know that the first and last tile I did came out looking fine though. I've never had a problem like this before and didn't do anything different as far as I know.

Many thanks,
Owen