Every 180k prints you should replace the fuser maintenance kit (part# WC4150-Z1) of your Xerox WorkCentre 4150. This will reduce jams, improve print quality, and extend the working life of your printer.

Xerox WorkCentre 4150 Fuser Maintenance Kit:  Part# - WC4150-Z1.    

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Every 70k pages you should replace the Fuser Maintenance kit (part# D1815-Z1) of your Dell 1815 DN Printer. This will reduce jams, improve print quality, and extend the working life of your printer.

Dell 1815DN Fuser Maintenance Kit:  Part# - D1815-Z1.    

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