The One and One is a personal laser printer that renovates complex internal structure and paper path into stable proportion and simple forms. Customers can add color toner to a mono printer, which gives a new user experience as they can get some benefits of a color printer for mono one’s prices. Toner cases that were hidden inside printers are redesigned to be visible through the transparent plastic cover on its top. The circular cap of the toner in the One and One is cool to be seen outside.