1. File storage and offline access The offline version of the CNC controller board is designed to connect to a computer and be recognized as a USB mass storage device, allowing direct access to files. 2. 8-inch high-speed GRBL offline controller Equipped with the latest 4.6 cm high-speed GRBL offline controller, this board enables offline engraving capability and eliminates the need for a constant computer connection. 3. Compatibility with all GRBL versions This controller board is compatible with all versions of GRBL, ensuring smooth and trouble-free operation. The baud rate is adjustable to provide flexibility in communication settings. 4. Manual control You can manually set the positions of the three axes (XYZ) to establish the engraving start point. The spindle can also be manually controlled, with convenient on/off operation. Use scenarios - On-site engraving without a computer: store design files on the board as a USB mass storage device and run engravings directly, ideal for field work or temporary setups. - Calibration and starting point setup: manually set XYZ positions to define the starting point and manually control the spindle for precise zeroing and test runs. - Prototyping and education: learn and demonstrate offline GRBL operation, including manual axis adjustment and spindle control, without requiring a continuous computer connection.