When everything is installed the next step is to adjust the laser spot size. To
do this you have to first drive Z manually so that lens is around 50mm (2
inch) up from bed. Then you can but the safety goggles on and turn on the
power of the printer (it is recommended that you put some small piece of
metal under laser in case that the laser turns on directly so that you don’t
burn hole in heatbed surface.)
Next send command from Repetier host (M42 P6 S1) to turn on laser with
lowest power. You should now get quite dim spot of laser to surface of
metal. Then you can replace metal or the piece you have under laser and
replace it with regular paper. Now you can do the fine tuning and adjust the
laser spot by turning the “focus screw”. You have to get laser spot to as
small as possible.
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