I've never tried refilling a one time only used cartridge. I was somewhat surprised that the printer completely refused to continue printer with a toner error half way through a print job. In my opinion the last page printed still had acceptable print quality. I don't know if it's a smart cartridge that the printer shuts off after a page count limit is reached, or if was maybe optically sensing the toner level. I couldn't find any way to get the printer to print any additional pages after the toner error appeared until I replaced the cartridge.