Our laser focuses beam width is the smallest and strongest at 3.7mm from the nozzle.
For marking/etching raster images with the highest quality set the bed height 3.7mm away from the surface of your material for the highest level of detail. The Blur heights on the tool can be useful for getting large darkened markings in areas that don’t require precision.
For cutting, it’s ideal to have the strongest part of the beam be in the center of the material. The focus tool has presets for the center of 1/8″ and 1/4″ material. The optimum focus distance may vary for different materials, so you may need to experiment and find what works best for you. Using the optimal focal distance for your material width also reduces kerf. Due to our lens focal distance you should not cut any materials thicker than 1/4″.
For engraving slightly into the surface you can play around with using different focal distances. The 3.7mm focal distance has such a small beam width which results in many ridges despite cranking up the interval/DIP. It may look better to use 6.8mm which will result in a smoother looking fill (at least on wood).
Example of how different focal distances create different beam width sizes.