The plug-in was developed by J Tech Photonics, and it’s available for download from their website, although the latest updates will usually be found on GitHub. It’s important to note that to upgrade to a newer version, you must uninstall any older versions before installing the newest. You also have to take into account the version of Inkscape, as you have to select the correct version of the plug-in to install.

YouTuber inquisitiveYT made a pretty robust YouTube tutorial for the J Tech installation process on an older version of Inkscape. While the user interface is different in the tutorial, the file locations and general process is the same.

Before installing the plug-in, make sure Inkscape is closed. The process is fairly straightforward.

1. Download the ZIP file of the correct version.
2. Extract the contents and save them to Inkscape’s installation folder by following the path from the Inkscape program file “Inkscape > share > inkscape > extensions”.
   • For Windows machines, this will typically be “C:Users\<yourUsername>\App\DataRoaming\inkscape\extensions”.
   • You might have to unhide hidden folders to access the AppData folder from the file manager.
3. Once you’ve pasted the plug-in files in the correct folder, the next time you open Inkscape, the plug-in will appear in the “Extensions” tab on the menu bar.

Before getting into the CAM process, it’s important to make sure the drawing is made in such a way that you’ll get the desired result. For this reason, let’s start by checking out the basic CAM settings.

When using the plug-in, the program interprets the bottom left of the drawing space as the 0,0 coordinates of your machine, so you need to be careful of where on the page your drawing is located. We recommend doing the following:

1. After creating or importing your drawing, add a surrounding rectangle with the dimensions of your slab of wood (or other material to be cut) so that you can locate where on the surface you want the drawing to go.
2. Go to “Edit > Resize Page to Selection” to reduce the size of the drawing space to the size of your slab of wood.
3. Delete the rectangle that you just drew, and you’re ready to go!

It’s also possible to import a raster image rather than designing an illustration from scratch. You just have to take into account that it should have good contrast and quality so that it can be properly interpreted by the software.

1. Import an Image by going to “File > Import” (or by clicking “Ctrl + I”), and then selecting the image or vector file using your computer’s file manager.
2. To convert a raster image into a vector object that can be cut, go to “Path > Trace Bitmap…” in the top menu. This will convert your image to a solid vector object.
3. To verify that your image doesn’t have additional lines and that Inkscape is selecting the correct lines to cut, you can check the outlines. To do this, go to “Fill and Stroke”, which you open with the hotkey “Shift + Ctrl + F”.
4. Select a null Fill and a solid Stroke paint. This will show you what the software considers to be the outer lines of your shape.

Solid color in a shape means the laser will engrave the whole area, while having only the outline and no infill will obtain an outline when laser cutting. This is because when you cut through the exterior, those sections would just fall off!

Creating a path means the object will stop being represented as only a drawing. It will now have mathematical properties, like direction and size, that can be interpreted by CAM software. Depending on the number of objects in your scene, you may have to do an additional step before you create the path.

If you have multiple objects you want to cut using the same setup, you have to group the objects first. This will make them behave the same, and the CAM process will be done with the same settings for all objects. This is important because grouping them will also create a path from one object to the other – in other words, coordinates of translation between objects.

1. If you have multiple objects you want to cut using the same setup, once they’re drawn, go to “Object > Group” (or click “Ctrl + G”) in the menu.
2. Once the objects are grouped, or if you only have one object, simply select the object and go to “Path > Object to Path” (or click “Shift + Ctrl + C”) to create a toolpath. This will create one cutting path for the object or group of objects.

Now that the program can interpret the drawing as a set of coordinates, it’s time to use the plug-in to convert this information into the G-code your laser cutter will follow.

1. On the menu, under “Extensions”, go to “Generate Laser Gcode”. It will show you that the J Tech plug-in has been added.
2. Once selected, a dialog box will open where you can set up your laser cutter.

Aspects like laser power or laser speed will depend on your machine and on the type of cut you want – for example, if you want to engrave or cut through. These are things you should already know from previous experience with your machine, but if you don’t, start by running some tests to try different intensities and speeds to learn how your laser works.

Here are some recommendations to take into account while setting up the laser cutter:

• It’s important to remember that a laser cuts right down the middle of the indicated path, in contrast to, for example, a mill, which would cut from a side.
• If you want to engrave rather than cut through, take care to use a lower intensity and a smaller number of passes.
• You can customize the Laser On and Off G-code commands, in case your firmware uses different commands from the ones indicated by default.
• The maximum laser power depends on the capacity of your laser.

Then, the final step is to indicate the filepath of the folder where your G-code will be stored. You can’t browse for it, so you have to go into your explorer and copy the folder’s address. Make sure the live preview is selected, then click on Apply. You’ll be able to see a preview in Inkscape of the toolpath your machine will follow.

Starting the Laser Cut

Once the file is completely prepared in Inkscape, it’s important to make sure that the laser toolhead is positioned correctly over the object being cut.

Different brands of laser cutters have different control types, but a general overview of how to do this is as follows:

1. Move the laser head to the bottom-left corner of the part of the material that you will be cutting. This will be the point that the laser cutter interprets as the bottom-left corner of the laser job being sent to it.
2. Check that there is enough stock to complete the cut by moving the laser to the four corners of the job and verifying that the laser never travels over a hole in the stock or goes past the end of the stock.
3. Return the laser cutter to the bottom left-hand corner of the job. Adjust the stock or the position of the laser as necessary to ensure that the laser will cut on the correct part of the stock.