Hi -- Can anyone tell me how to successfully refill the ink cartridges for the Canon PIXMA ip4300 inket printer? I refilled my Epson cartridges for years, but I don't have any good luck refilling Canon cartridges for the ip4300 printer. I put electrical tape on the back of the ports as I did for the Epson cartridges, but when I take the tape off to put the cartridge back into the printer, the ink just flows freely and rapidly out of the cartridge ports, making a huge mess. Many thanks for any help.