This is because such sets include not only the printers themselves, but also photocopying paper and additional printing accessories that can be used in everyday work while making prints.
Such original printing devices can successfully reach companies and offices as well as universities.They are also bought by those private individuals who know well that they will have to make a large number of different types of printouts that are not only used at home.
In addition, on the Internet you can find special websites dedicated to printing.
There are also pages with tips for people who work at photocopying points or make a large number of private printouts.
Laser printing is an electrostatic digital printing process. It produces high-quality text and graphics (and moderate-quality photographs) by repeatedly passing a laser beam back and forth over a negatively charged cylinder called a "drum" to define a differentially charged image.1 The drum then selectively collects electrically charged powdered ink (toner), and transfers the image to paper, which is then heated in order to permanently fuse the text, imagery, or both..
As with digital photocopiers, laser printers employ a xerographic printing process.However, laser printing differs from analog photocopiers in that the image is produced by the direct scanning of the medium across the printer's photoreceptor. This enables laser printing to copy images more quickly than most photocopiers.Źródło: https://en.wikipedia.org/wiki/Laser_printing