Lexmark W810n - Optra B/W Laser Printer Reference page 127

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Use the green handle to pull the old toner cartridge out of the
toner box.
See "Recycling used supplies" on page 110 for information on
recycling the empty toner cartridge.
NOTE: Lexmark does not recommend refilling used toner
cartridges or purchasing refilled cartridges from a third
party. Print quality and printer reliability cannot be
guaranteed if you do. The printer warranty does not cover
damage caused by using refilled cartridges.
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