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In HP laser printers, an HP toner cartridge is the usable part of the printer. An HP toner cartridge is also replaceable and sometimes reusable. The cartridge itself contains toner powder, which is usually dry and a mixture of carbon, plastics, and often coloring agents. Toner is put on the paper inside the printer using electrostatic charges, and then a roller smashes the toner into the paper and they fuse.

Often, people realize that toner cartridges can cost more than low-end printers. This leads to some people actually disposing of printers when the toner runs out, because they do not want to buy a new cartridge. This is not a good idea for a few reasons. First, most people don’t know that newly purchased printers usually only come with a toner cartridge that is one third full. Second, there are toner recycling programs that help alleviate the costs of new cartridges. This is also counterproductive because often the manufacturer takes a monetary loss selling the printer in order to recoup profits selling cartridges. Continuously buying new printers will only drive the price of both higher.

There are actually two different kinds of laser printers, and each uses a different type of cartridge. Lower-quality printers usually contain two separate replaceable parts. The first part is the toner cartridge, which has an average life of about two thousand pages. The second part is the drum unit that uses electrostatic charges to transfer the toner to the paper, with a life of roughly forty thousand pages. Certain high-end printers have toner cartridges that combine both the drum unit and the toner cartridge in one replaceable cartridge. Although this can be very reliable, since drums usually have a much longer life than toner cartridges, many people find this setup to be unnecessary and also often too expensive.