The ROHS 721 is a fantastic mechanical plotter. It cuts vinyl, reflective, and even thin cardstock beautifully. However, its electronics are dated. If you cannot get the driver to work after 2 hours of troubleshooting, consider buying a $20 . This bypasses the plotter’s internal USB logic entirely and gives you a clean, modern driver path.
Without the correct , your computer sees your plotter as "Unknown USB Device." The driver translates vector lines (paths) into a language the plotter understands—typically HP-GL (Hewlett-Packard Graphics Language) or DMPL. rohs 721 cutting plotter drivers