I have used remanufactured/recharged toner cartridges for my HP Laser 4-in-1 printer in the past. But all too often, refilled cartridges leak or produce poor print quality. But the huge savings (90% over new cartridges) were too big to pass up. So I ordered a set because I figured even if it would take two or three sets to get a good and complete set of four cartridges I would be worth the dollar. forthcoming. Installed a set of TEINO rechargeable cartridges, the printer worked perfectly. However, the printer software recognized that the cartridges were "non-HP" and warned me that damage to the printer caused by these cartridges would not be covered under the HP warranty. My printer is about 10 years old, so any warranty would have expired long ago. But for those of you with newer printers, you need to know that your printer stores this information and it can be used against you in relation to the printer's warranty/repair.