The waste toner bottle catches any excess toner residue that can remain on the drum inside your laser printer. Without it, toner powder can collect in the printer and negatively affect print quality. Laser printers with a waster toner bottle use a sensor to track the toner waste level, notifying you when it is time for replacement. Not all printer models use a waste toner bottle. Some toner cartridges have a section built into the cartridge that catches the toner, so every time you replace a cartridge, you are also getting rid of toner waste. Check the list of compatible printing supplies for your particular printer model to see if your machine uses a waste toner bottle. If a waste toner bottle is not mentioned, then it is likely a part of the toner cartridge.
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