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Lift the laser module by twisting the knob, easy to adjust the focal length.
Large Lead The knob can travel 8mm in one turn.
Adjustable Damping Use the Allen wrench to adjust the machine screw, you can adjust the tightness of the knob rotation.
Lengthen the moving range of the laser module in the z-axis direction, can engrave thicker material.
One-piece structure, more robust and reliable