With a 4-in-1 laser printer, you have a complete solution for your office. All-in-one printers can print, scan, and copy. If the printer can also fax, it's called a 4-in-1 printer. With these printers, you can fax, copy, scan, and print fast and affordably. Some models can also fax, print in duplex, and scan, and some all-in-one laser printers have an automatic document feeder. You can scan or copy a whole stack of documents in one go.