The sorting is achieved by using technology similar to what is used in inkjet printers. Solid ink printers can produce excellent results. Advertising emphasizes low price for ink cartridges rather than for the printers themselves. It handles memory and peripherals like keyboards, monitors, printers, and speakers. Printers and press operators physically print the newspaper. HP offers a standard one-year warranty on all of its LaserJet printers. Acquisition and operating costs are similar to laser printers. Laser printers combine the best features of both printers and plotters. Thermochromic papers are used for thermal printers. Currently there are profiles for mobile devices, printers, and television sets. This is a list of companies who produce or have produced digital printers. Y resolution is comparable to that of laser printers. The paper is used in compact photo printers. The format was developed for 3D Systems' first commercial 3D printers. Fab@Home is the other opensource hardware project for DIY 3D printers.