I have been tinkering with this Chinese made Redsail M500 laser engraver for 3 weeks now. Although I would say that it has limited capabilities, it fits my needs. One problem that I have been trying to fix is the ghost image it creates on the product. I was able to line up the image along the x-axis but there is still the secondary image directly below the original image and parallel to the Y-axis, it stays, no matter how I tweak the settings. If I will use a crosshair image as a guide, I could line up the vertical lines but uniting the horizontal lines drives me crazy.
If I do single pass engraving, everything is crisp and clean, but bi-directional engraving produces the other image directly below the original on the laser head's return trip