The process of downloading the HP Designjet 3D Printer Firmware 9.1 driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the HP Designjet 3D Printer Firmware 9.1 driver from the primary server - this is the manufacturer’s HP official website). If the download still fails to run, check whether your anti-virus software is not blocking the connection to the manufacturer server of the HP Designjet 3D Printer Firmware 9.1 diver.