Who ISN'T aware of this? This has been the case with all printer manufacturers since the advent of printers. Use a generic printer cartridge or ink or toner and your warranty is void. Even refilling an existing oem cartridge at an Office Max will void the printer warranty.I'm glad you are familiar and OK with a manufacturer not honoring their warranty-- but I'm not sure everyone is aware of this.
This was the case 25 years ago and is still the case today.