It might surprise some people to know that not every bit of toner is used in printing. It is part of the process for your printer to have waste toner during printing. For this reason, many large-scale printers and copiers have a waste toner bottle that gathers up the waste toner ready for disposal when it is full. Luckily, they do not have to be changed as often as the toner cartridges, and the Lexmark 72K0W00 waste toner bottle should last for up to 115, 000 pages of printing. Your printer will notify you when the waste toner bottle needs to be changed.