Lexmark has a chip in their ink cartridges that meters the amount of ink used. You can't refill the cartridge without resetting the chip!!!
In other words you have to buy their over priced ink. The ink cartridges are where they make billions of dollar in profit. I printed a few leases out with a full cartridge and it ran out of ink in no time. This is a complete rip off !!Get more detail about Lexmark X3650 16F1200 All-In-One Printer.