A method for a printer comprising a transport device comprising an endless transport belt (4, 104) supported on a pair of support rollers (3A, 3B, 3C), which between them define a medium support plane, over which medium support plane a print station is provided, wherein the method comprises the steps of - transporting in parallel a plurality of individual print media perpendicular to a scanning direction of the print station on the medium support plane, the print media having different dimensions; - determining positions of the individual print media; - based on the determined positions, jetting marking material for forming a designated image specific for each print medium on each respective print medium, wherein the above steps are repeated such that print media are printed in a plurality of parallel lanes on the medium support plane perpendicular to the scanning direction, wherein the printer is provided with a plurality of guiding bars extending in the transport direction and positioned at a side of at least one lane of the plurality of parallel lanes in order to guide the individual print media into one of the plurality of parallel lanes, wherein the printer comprises a print controller for controlling the print process for a digital image to be printed, the print controller comprising two print queues for receiving digital images to be printed by the printer, and the method comprises the steps of - establishing if the digital image requires to be right aligned or left aligned along a guiding bar, preferably by the operator, in case of a required left alignment, adding the digital image to a first print queue of the two print queues, and in case of a required right alignment, adding the digital image to a second print queue of the two print queues, characterized in that the printer comprises above each lane a signaling object which is preferably a LED lamp and which is activated when the corresponding lane is enabled to receive print media, and the method comprises the steps of determining if the next image to be printed resides in the first queue or in the second queue, in case of a residence in the first queue, activating the signaling object of each lane for which the print media requires to be left aligned, and in case of a residence in the second queue, activating the signaling object of each lane for which the print media requires to be right aligned. - transporting in parallel a plurality of individual print media perpendicular to a scanning direction of the print station on the medium support plane, the print media having different dimensions; - determining positions of the individual print media; - based on the determined positions, jetting marking material for forming a designated image specific for each print medium on each respective print medium, wherein the above steps are repeated such that print media are printed in a plurality of parallel lanes on the medium support plane perpendicular to the scanning direction, wherein the printer is provided with a plurality of guiding bars extending in the transport direction and positioned at a side of at least one lane of the plurality of parallel lanes in order to guide the individual print media into one of the plurality of parallel lanes, wherein the printer comprises a print controller for controlling the print process for a digital image to be printed, the print controller comprising two print queues for receiving digital images to be printed by the printer, and the method comprises the steps of - establishing if the digital image requires to be right aligned or left aligned along a guiding bar, preferably by the operator, - establishing if the digital image requires to be right aligned or left aligned along a guiding bar, preferably by the operator, in case of a required left alignment, adding the digital image to a first print queue of the two print queues, and in case of a required right alignment, adding the digital image to a second print queue of the two print queues, characterized in that the printer comprises above each lane a signaling object which is preferably a LED lamp and which is activated when the corresponding lane is enabled to receive print media, and the method comprises the steps of determining if the next image to be printed resides in the first queue or in the second queue, in case of a residence in the first queue, activating the signaling object of each lane for which the print media requires to be left aligned, and in case of a residence in the second queue, activating the signaling object of each lane for which the print media requires to be right aligned.