Chips for toner and drums (combined with developers) are cheap. I have relatively small print volumes and mostly black color, when it is not possible to buy native cartridges from 6600/6605 С400/C405, I use original cartridges from Versant 80. I took out the plastic plugs there, filled it, closed it. A separate mining bunker (there is an optical sensor) costs a penny, i. E. When refueling, nothing needs to be poured out of the cartridge.
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