An in-car entertainment unit provides a radio, a CD player and/or a DVD player, a display and a printing unit. The printing unit comprising includes a printhead, a replaceable cartridge containing a stack of print media sheets and an ink reservoir for supply of ink to the printing unit. The supply of print media sheets and the ink reservoir are arranged in stacked relationship relative to one another within the cartridge. A chassis receives the cartridge in use and provides ink hoses for coupling the printhead to the ink reservoir and a feed system for feeding print media sheets from the stack to the printhead.