I have a canon printer and I am using the kopykake edible ink cartridges which worked fine until the ink got low and I refilled the cartridges instead of replacing them. I don't know what has happened since then but sometimes the cartridge jams and the images have streaks in them. I clean the print heads by soaking in hot water and also alcohol. It seems if you leave the cartridges in the printer the food coloring leaks out in the bottom of the printer and I think that is what is jamming it. I started taking the cartridges out and keeping them in a ziploc bag and a sealed container to keep them from drying out. When I put them back in I can't get the coloring to come out!! I am so frustrated!! I have to work with the machine about 2 hours to print one thing!! ANy tips would be appreciated!!
I hate my cannon printer. I too never had a problem till I refilled the cartridges... My black doesn't even come out anymore, but another CC'r suggested I replace the chip on it. I ordered a new one so we'll see... My guess is you should invest in a brand new set of cartridges.
The print cartridge can get airlocked from refilling. There is a tiny hole on the top near where you fill them. If you take a clean needle or pin and pop it, it might do the trick. I learned the hard way you can't refill alot of times and now I seem to have broken my print head trying to unclog a stubborn clog.