The most expensive part of buying an inkjet cartridge is the actual cartridge. The ink is much cheaper and therefore, buying refilling your old cartridges rather than buying new ones, you are able to save money that can be used on other things. The only problem with refilling cartridges is that there are so many different types that HP creates, so the plan of attack might vary. For the most part, though, it is the same across the board.

Refilling the Cartridge

Before you begin to refill the cartridge, make sure that the space you are working on is not a cherished space. Ink stains and therefore, if you spill, it will ruin furniture. To prevent against this, lay out old rags. The rag will soak up the ink before it gets to the furniture.

Once you have your ink replacement and you've got the individual cartridges, you can get to work. The first step is to locate the hole in which the ink will be placed in. This is usually on the top or the bottom of the cartridge. Look for a plastic film because this is typically where the hole is.Refill an HP Inkjet Cartridge

Using a small, non-medical syringe, insert the ink into the cartridge. For black ink, it is best to use around 20 milliliters. For color, use about 10 milliliters for each chamber. Before going from color to color, be sure to clean out the syringe as much as possible to ensure that the colors don't mix and create an ugly color that isn't desired for printing.

Squeeze the sides of the cartridge and try to get a few drops of the ink to drop from the print head. This way, you know that the ink has reached the bottom of the cartridge. Then, allow it to stand with the print head down for a few moments. What you are doing here is getting rid of any excess ink and allowing the pressure to equalize within the cartridge. Once you've done this, put the cartridge back into the printer and do a test print. If the print looks good, you've done a successful refill.