An inkjet printer containing a print zone and an inkjet printhead for printing on a substrate in the print zone, a supply unit for storing and delivering the substrate for printing, and a transport unit for transporting the substrate from the supply unit to the print zone, in which printer the supply unit contains a number of substrate holders, each holding a roll on which a substrate web is wound, each substrate holder being operatively connected to a sensor for detecting the end of the web in the substrate holder corresponding to that sensor, wherein the transport unit includes a first transport means for engaging and transporting the substrate emerging from the supply unit, a downstream, second transport means for further transporting the substrate and positioning the same in the print zone, and a guide element rotatably disposed between the first transport means and the second transport means.