Place a workpiece in the machine. Rotate the focus bar (acrylic bar) downward until it is vertical. Loosen the laser head focus ring and lower the laser head until the focus bar rests on the workpiece. Tighten the laser head focus ring, and rotate the focus bar upwards until it is horizontal.
▲ loosen the laser head focus ring
▲ the focus bar should rest on the workpiece
The focus must be readjusted each time the material is changed.