When I bought the HP 3310 printer I thought the multiple ink cartridges would make printing costs much more economical since you could buy the color cartridges individually. However, I didn't realize that they had a built in expiration date regardless of the amount of ink left and that this would stop the printer from functioning. In addition, my printer hit an error when one of the cartridges still had plenty of ink and 4 months until expiration. It would not let me print until I replaced the cartridge. After an hour online with the service tech, his solution was to take the printer to a service center or upgrade to a new one. I told him I probably would upgrade but it wouldn't be to an HP. What a ripoff. I won't be buying HP again!