Why does my printer have black smudges?

Black lines and smudges on printed output can be due to dirty printers. The accumulation of dirt, dust, or toner on a printer’s rollers or transfer belt can leave tracks on the page when the paper moves through the printer. … That will leak toner onto the printer and paper, which leaves black marks on the printed output.

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Hereof, how do you unclog a print nozzle?

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