nejelaser_master_2 | NEJE.wiki
If you use laserGRBL and lightburn software to adjust the focus, you need to enter a command: M3 S1; and give a motion command, for example: G0 x10 y10 f1000; so that low light can be lit; If it is mainly used for engraving, adjust the focus to a distance of 35mm-50mm below the object;