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Safety instruction! You have to wear laser goggles at all the times before connecting power to laser and operating it as any reflections from laser can blind you immediately. When you are finished to operate laser disconnect power from it immediately so that you don’t activate it accidentally while 3D printing or operating the printer.
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For wiring of the laser connect the PWM control wire to the servo port of MKS GEN board as pointed by arrows in following picture. Be careful to connect wire right way so that colours are facing same way as in picture (black and red).
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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.)
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Software To make gcode files for engraving you have to first install Inkscape (https:// inkscape.org/en/) and after installing it you have to install repetier laser plugin for it. You can find great instruction on installing and using the plugin from repetier website (https://www.repetier.com/repetier-g-code- plugin-for-inskscape/).
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