Just like an inkjet printer, fax also requires regular monitoring toner / cartridges to be replaced. Fax Restored and refurbished ink cartridges can also produce the same results marks your cartridges savings of up to 50%. Most fax toner cartridges are easy again, and they have a handy filling hole at the top of the cartridge, which allows you, with no refill cartridge from the printer. You can refill cartridges up to 6 times depending on the capacity.