Edit: I'm changing my rating to 5 stars based on the excellent customer service. The seller contacted me, explained the problem and offered a refund except that it didn't meet the return policy. Looks like I'm just unlucky with a defective batch. ---- Original Review: Black toner print quality is terrible on my Canon mf644cdw. I've tried all the post-install cleanup settings, but there are always gray spots, even on the back side of the page. I tried it with my previous toner and it works fine. It definitely seems to be a new toner
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