Using a re-manufactured cartridge does not affect any printer’s warranty unless the printer is damaged by refilled cartridge. Often leaking in a poorly refilled cartridge, clogs the printer head, damaging it; you cannot claim warranty in this case. A reputed cartridge filling company makes sure that the refilled cartridges they supply do not damage your printer, and in case of any unprecedented occurrence, they take care to get your printer repaired. However it advised to read your printer’s warranty terms and use cartridges accordingly.