1. Use Photo tray of the printer to print frosting sheets. Using Paper tray can cause damage to the printer as frosting sheet tends to slide off its backing while going through a printer. Try to set your edible image printer to the default setting of using the photo tray.
2. Make sure to hide the uneven edges on the cake or cookie by putting some kind of border around the image.
3. It is very important to properly store the frosting sheets if you want to print good images. Always use the zip lock plastic bag to store them and seal the bag immediately after removing the frosting sheets you want to print.
4. Try to use the printer at least once in every 5 days so as to prevent ink clogging.