Relative Z moves only: This setting tells LightBurn to read the height of the machine when the job starts, and uses that height as the starting point for all Z moves, ignoring any specified material height. Toggle this switch to change the overall direction for Z moves. Reverse Z Direction: Most DSP systems have 0 as the highest point, with positive numbers moving the laser head further from the bed, however some systems reverse this. If you to not set relative mode, and do not set a material height, the default of 0 may cause LightBurn to raise your bed to a point where the workpiece could contact the head of your laser. Note: enabling Z control means that LightBurn will always emit Z values for a running job, and therefore requires that you set either the "Relative Z moves only" toggle below, or a material height value on the main cut panel. The S-Value Max setting in LightBurn must match your controller setting, or you'll either get not enough power output if LightBurn's setting is lower or very small power numbers will set your laser to full power if LightBurn's setting is higher. Smoothieware typically uses a value from 0 to 1 and supports fractional numbers in between. If you do not set this value, LightBurn will use the same speed as the G1 moves. A note for Marlin users: Since Marlin treats G0 and G1 moves identically, this value is used to specify the speed for rapid moves. With the Fast Whitespace switch enabled, LightBurn will boost the speed through blank areas to the speed you indicate, if it is faster than the current engraving speed. If you are engraving slowly to get a good burn, but the image contains a lot of empty space white spacethis takes a long time. When engraving an image, LightBurn normally moves at the same speed across the entire image. See the help for Scanning Offset Adjustment here. Scanning offset is useful when doing raster or vector scanning at high enough speeds that delays in your power supply cause the firing point to be a little behind where it should be. If you have a DSP laser, like Ruida or Trocen, the origin is usually where the limit switches are placed. If you have a GCode based system, this is almost always at the front left, regardless of the location of your limit switches. This is the origin or 0,0 location for your laser. Set this to the maximum X and Y travel for your laser. This is the working size of your laser bed.
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