A. There is no way that refilling your cartridge at Payless Cartridge can cause any harm to your printer. Refilling an ink cartridge is cleaning the print-head, simply filling the empty ink cavity and testing the cartridge. For toner cartridges we also replace any worn parts. However, we do not alter any of the casing or parts of the cartridges that your printer requires to operate. We are so confident that there is no risk whatsoever to your printer by using refilled cartridges that we offer a 100% customer guarantee.