Hello I have one problem. I bought Canon Pixma IP4950 in August 2012 and uses rechargables cartridges refilled for me with special inks for this printer (Sensient brand), the cartridges are transparent with chip, the problem is with printhead nozzles, when I printed the test page and three colors shows blurs lines or completely missing, I probe with deep clean in the Canon Software but situation is not better, I contact with the my ink provider and he said I can use the clean liquid provides with him kit for clean printhead. I prefer return printer to Canon because is still in warranty (six month only and in Spain the warranty is for two years), Canon is now repairing my printer. My ink provider said to me the possible cause of the problem is waste ink between the cartridge and the zone with cartridge give contact with duct of printhead for refill many times the transparent cartridge, my question is, this situation is possible with only 5 recharges for each cartridge? is normal nozzles clogged with only six months of use and around 550 pages and 70 DVDs printed? Thanks for the help.