In a printer with two printing stations, two printin-head holders (22) with holding means (26, 30) for the detachable holding of one print head (24, 48) each are arranged on a carriage (16) guided displaceably parallel to a print backing means (36). The respective printing-head holder (22) is designed for a first type of printing head (24) and can be connected to a printing-head adapter which, in turn, is designed to hold a printing head (48) of a different type.