Unlike multi-function printers that allow users to print, scan, and copy, single-function printers are used only to print documents. Laser printers hold a few advantages over ink-tank printers. One of which is the printing speed. Laser printers are generally preferred in large offices because they can quickly print large quantities of documents of various sizes including A4, letter, among others. If you are looking for single-function printers, then consider these popular options.