USB mass storage storage The offline unit is recognized as a USB mass storage device when connected to a computer, allowing direct access to saved engraving files without special software. 8-Inch High-Speed GRBL Offline Controller An 8-inch offline controller for GRBL that enables offline engraving of files. It can be connected via USB to a computer for file transfer and is compatible with all GRBL versions. Baud rate is adjustable to match different machines. Manual Control Manually set the xyz axis positions to define the engraving start point and manually switch the spindle on and off for precise control. Document Engraving Save files on the offline board and connect it to the GRBL control board to engrave without a computer. Use cases - Field work or workshops without a laptop: store designs on the offline board and engrave directly when needed. - On-site production with limited equipment: transfer files via USB, then engrave without requiring a continuous computer connection. - Quick setup and verification: use manual start point positioning and spindle control to preview and validate engravings before running the job. Compatibility and performance Supports all GRBL versions; baud rate is adjustable to accommodate various systems. Designed to provide offline file access, flexible transfer options, and manual control for reliable engraving workflows.