Transfer roller, of course. Note how print quality degrades as you get towards the bottom of a toner cartridge on a cheap printer, the consistent pattern of pri

Transfer roller, of course. Note how print quality degrades as you get towards the bottom of a toner cartridge on a cheap printer, the consistent pattern of print artifacts. >changed by changing the drum Sure, it depends on the threat model. If you're producing many documents some time apart, replacing drums and cartridges could be a purchase signal in of itself. If you're doing something very risky, like publishing nuclear weapon plans, ISIS recruitment flyers, or Clinton foundation invoices, then leaking just a few bits of identifying information could be life-ending. Cf https://www.gwern.net/Death-Note-Anonymity https://www.gwern.net/Death-Note-Anonymity