If you use an ink jet printer at home, you know those replacement cartridges can cost a lot of money. One way to extend the life of the ink cartridges is to check if the cartridge is actually low on ink. Most cartridges have an internal mechanism that monitors usage when you insert it and estimates how much ink is left. Conservatively. Often, when the printer says it's low or out of ink, it really isn't. You can reset the memory on your cartridges with a paper clip. On the side of most cartridges is a pinhole reset. Just insert a paper clip and re-install the cartridge. Use it until all the ink is actually gone.