Inkflow is very important when it comes to your edible prints. If your inks are not flowing into your printer as they should, your prints are already off before you even click print. One way to test out whether your inks are ready to work well with your printer and if your nozzles are functioning properly is to run a nozzle check. (Side note: It's very possible that the reason your prints are not coming out right may just be that your cartridges are low on ink, so be sure to take a look at them to see if they're low as that can be the entire reason behind your printing issues.)
A nozzle check is a test print you can usually run from your printer’s display panel to make sure your Cyan, Magenta, Yellow and Black ink colors flow well inside the printer. If your images are coming out streaky, with missing colors, or are just completely off, running a nozzle check is a good starting point to help narrow down what your issue might be. Running a nozzle check on a regular sheet of copy paper (before printing on edible paper and wasting the sheets) can help you instantly know if you can start printing right away or if you have some maintenance to do.