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Your printer says a supply is low, and the supply turns out to be two different things: a toner cartridge and a drum unit. They sit together, they wear out at different speeds, they cost different amounts, and replacing the wrong one is the most common way printer owners waste money. This guide explains what each part does, how long each lasts, and the exact test that tells you which one your print problem is actually coming from. The 20-second version Toner cartridge: the container of toner po

Disclosure: Clever Supplies sells compatible cartridges for all of these brands — which is exactly why we'd rather you buy the right number the first time than the wrong one twice. HP, Brother, Canon, Lexmark, Kyocera, Ricoh — every brand runs its own numbering system, and none of them explain it on the box. This is the complete decoder: how each brand names its cartridges, what the letters and numbers mean, and how to never buy the wrong one. The universal rule (all brands) Every ca