For a run of 52,700, I changed the drum unit twice, once by replacing the drum unit, the second time by replacing it with a compatible one. And about 7 non-original TN3480 Busf and ColorWay cartridges. It is sensitive to the quality of cartridges, refilled ones can print normally, or they can immediately fail. It's easier to install new compatible ones than to refill. Now there are G&G "penguin" cartridges, they are more expensive, but on the first impression they are better, but we'll see.
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