Computer Ink Cartridges

Do you have to keep buying brand new ink Cartridges from lexmark?

Does a re-fill in the color and or black ink cart work when put in the computer to print or do you have to keep on buying brand new ones from stores?

I think refill will work!!!!!!

HP Printer Cartridges : How to Refill Ink Cartridges in the HP 970CXI Printer