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Summary: Cartridges for the HP 970CXI printer can be refilled in two very distinct methods. Refill the bladder of the black cartridge and the sponge of the colored cartridge in the HP 970CXI printer with help from an employee of an ink-filling station in this free video on HP printer cartridges.
"Hi, this is Taylor. Today, we're going to discuss how to refill the ink cartridges for an HP970CXI printer. To refill the cartridges for this particular printer there are two very distinct methods. The black one has a bladder, as opposed to the color one contains sponges. To refill the sponges for the color you'll need three syringes with long needles and accordion ink. To refill them simply punch out the top holes which are already there. They're just little plugs, so just punch them out quickly. With the ink cartridge pointed towards you left to right refill em' with the yellow, magenta, and cyan. Do not go according to the sticker as it will mess you up. To refill this, simply insert the needle into the sponge and insert ten to twelve milliliters of ink. Once you've finished there's no need to cover the top. Just simply clean the print cartridge and place back in the printer. For the black cartridge you need to remove this ball bearing. Actually, what you need to do is press it into the cartridge. Inside of there is just a giant bladder. Pushing it in will not affect the cartridge at all. Once you have pushed the ball bearing in simply inflate the bladder with some air with a syringe. Once you've done that grab your needle with the full of ink, and put in just a quarter of the way down and slowly depress the syringe; filling with about forty five milliliters of ink. Once you have filled with ink simply put in a regular size bb into that opening and push down with a pair of scissors, or with some, with a hard object. After you've done that this cartridge does need to pressurize, so if you have a paper towel and a bowl put the paper towel on the bowl and about five milliliters of ink will soak out of the cartridge onto the paper. After about fifteen minutes of standing like this the paper towel will be soaked with ink so use caution, but after that time the cartridge will be primed, ready to be used, and you can insert back into the printer."
eHow Article: How to Refill Ink Cartridges in the HP 970CXI Printer