Many of the Hewlett Packard and Lexmark printers will indicate a need for these kits at the factory preset intervals by reading "USER MAINTENANCE" in the control panel and some will not. Check the configuration page of your printer and read the page count. If you've never had service or a maintainence installed and your within the page counts shown below, you probably need one. Many of these kits will fit Canon laser printers and Apple LaswerWriters as well.
Both Hewlett Packard and Lexmark recommend regular annual maintenance accompanied by a Maintenance Kit. Look for the intervals for each printer below
Core Charge will be added per unit for Fuser.
Exchange requires return of used Fuser Assembly within 30 days ONLY. Call for Non-exchange prices.