Try click here They will replace your printer if any of their products causes problems or if the warranty is voided by the manufacturer but please read their guarantee to confirm for yourself. An excellent company with very good products. I always use them for refilling my Lexmark cartridges.
I also have a Lexmark printer (Z708, still under warranty)in addition to an Epson C80. I agree with Wak, choicestationery are a very good company, fast and reliable service as well as being very cheap. I'm not sure though how well Lexmark cartridges fare with refill kits, can anyone advise?
I have a Lexmark X75 and have just started my second pair of refill kits from choicestationery The cartridges still print as if new so you can judge for yourself. The trick is to refill them as soon as they show signs of becoming empty and don't give them a chance to dry out.