In LaserGRBL device settings, check the Invert X Axis or Invert Y Axis option, save the settings, and then test the movement.
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Using LaserGRBL for laser engraving, there is an error in the axis direction
When I was using LaserGRBL for laser engraving, I found that the direction of the laser head movement was completely uncontrollable. Although clicking on the X-axis to move forward in the software, the laser head deviates in the opposite direction; The Y-axis is also the same, which causes the pattern I see in preview to not match the actual carving position at all.
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LaserGRBL uses the standard Cartesian coordinate system, with the origin (0,0) located at the lower-left corner. In this setup, X values increase to the right, while Y values increase moving away from the operator. If your engraver moves in the opposite direction on one or both axes, you will need to reverse the axis motion by adjusting controller parameter $3. This setting can be found under Grbl → Grbl Configuration in the menu.
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