In is located in Extensions -> Generate Laser Gcode -> J Tech Photonics Laser Tool. To test the laser cutter just draw a circle inside Inkscape and convert it to a path (Path -> Object to Path) or press Shift+Ctrl+C. With the Laser Plug-Inplugin from J Tech Photonics you can create gcode files that can be sent directly to the 3D printer equipped with a laser head. Inkscape is an application that can be used to create vector graphics images.
The distance that works well is 5 cm above the engraving / cutting surface. I have used the masking tape on the 3D print surface to test the engraving. To turn off the laser execute M107 command. Like this you will be able to set the focus. Execute M106 S100 to set the laser to half of the strength. To test the laser you can use Pronterface slicer and send the commands that usually control the printing fan. The laser module fitted perfectly could be secured in place with a single M3x20mm screw. and the laser module mount could be installed in place. The extruder (and all the attached cables) could now be disconnected from the 3D printer. I have found this laser mount design for Prusa i3 and started to print it. It was time to look for the laser module mount on Thingiverse.
Now I could disconnect the print fan that was attached to D9 pins on the RAMPS board and attach my wire that will lead to the laser module. These dupond jumper wire housings for sure come in handy. The laser module had a JST plug attached to it and I didn't want to cut if off, so I have decided to make a cable with a jumper wire connector. The set that I ordered in a Chinese webshop was with safety glasses and that was very handy as they are absolutely necessary when using the laser. The one that I have used had a power of 2500mW, which is enough to engrave and cut thin sheets of plywood. It is easy to mod your 3D printer to become a laser engraver / cutter.
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