Open Source Firmware The board uses opensource firmware that converts Gcode commands into precise stepped motor signals, enabling accurate motion control across multiple axes. Assembly as disassembled parts; basic soldering is required to assemble. This makes it a handson project that can be rewarding for enthusiasts. Multiaxis Support Supports four axes with PWM spindle and direction pins, allowing seamless control of X, Y, Z, and A axes for expanded options. Versatile Application Compatible with GRBL 0.8 and suitable for engraving machines, 3D printers, and various drive expansion boards. Key benefits Why you need it: enables a 4th axis and flexible control for engraving, milling, and printing projects. How it solves problems: opensource firmware provides adaptable motion control; modular assembly allows an affordable upgrade path. What makes it stand out: opensource firmware, 4axis support with PWM spindle and direction control, GRBL 0.8 compatibility. Use scenarios Engraving with a rotary axis: upgrade an engraving machine to enable cylindrical or rotary engraving tasks using the A axis. 3D printing with multiaxis capability: add an extra axis to a hobby printer for innovative or complex prints. Drive expansion projects: use as a controller expansion for other drive boards to broaden motion control options. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin