Lemark have manufactured your printer, so it only makes sense to use genuine 51B00A0 cartridges in it if at all possible. By using original Lexmark 51B00A0 toner cartridges the MX317dn (or any other compatible printer) will give you the best results possible from the hardware.Brand new Lexmark 51B00A0 toner cartridges have no sign of degradation to print quality and are filled with uniquely formulated black toner powder too. With an estimated 2,500 prints at a reasonable asking price, the original Lexmark 51B00A0 toner cartridge is certainly worth considering.