I am going to share a trick, how to make the ink flow from the ink tank reservoir into the Cartridge smoothly for Continuous Ink Supply System (CISS). This trick only apply to sponge type cartridge, where it uses sponge inside the cartridge to hold ink. Color printers made by Canon and HP usually use sponge type cartridges. I am using HP Photosmart C4580 All-In-One printer which can print, scan,