It is essential edible printers are well maintained as they can be susceptible to clogging especially if the printer isn't used regularly. It is also important to use a good quality edible ink. EPS ink has been double filtered to help prolong the life of the printhead. Edible Print Supplies only supply Canon printers for the simple reason the printhead can be easily removed and cleaned unlike Epson printers.
We've created a couple of easy videos demonstrating how to remove and clean the printhead.
It's important to be aware sometimes it can take several cleans of the printhead for clogs to clear. If cleaning the printhead doesn't work, it may be time to purchase a new one. Genuine Canon replacement printheads can be purchased online.