Methods and arrangements are provided for use in a printer and associated computer(s). The printer is configured to periodically and/or automatically detect when changes are being made to a print media supply tray and output/display the current configuration of the print media supply tray for use by the user and/or programs running on the computer. The current configuration of the print tray is determined using detectable mechanisms that are either hardware and/or software implemented. The configuration of the supply tray is displayed to the user via the printer display, a tray-mounted display, and/or though a graphical user interface (GUI) on the computer. The configuration is defined by at least the size and type of the print media associated with the supply tray.