” This toner cartridge is almost endlessly refillable, as long as the cartridge is not broken or leaking.
However, Imaging Units have a limited lifespan, as do other maintenance parts such as the Fuser, Transfer Roller, Redrive Roller Assembly, Pick Roller, Transfer Roll, Tray Separator Roller Assembly, and more.
You can keep refilling the cartridge and install a new chip as long as the print quality remains consistently solid and perfect.”