How do I configure the axes direction in LaserGRBL?
To change the axis direction, set parameter $3 according to a bit mask that allows reversing the direction of any axes: X, Y, Z. For example, setting value 1 will invert only the X-axis while value 2 will invert the Y-axis and so on. Proper configuration ensures correct use of your laser marker. (Page 4)
From the official Lasergrbl Laser Grbl Software manual, page 3
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