7 Steps on How To Create DXF Files for Laser Cutting

The DXF (Drawing Exchange Format or Drawing Interchange Format) file format is one of the two most common formats used in laser cutting. DXF uses vectors, which can be read by laser-cutting machines and turned into cutting instructions. There are many applications that can be used to create DXF files, as DXF is an open-source file type. Many applications are free including Inkscape®. This article will discuss the seven steps required to make a DXF file for laser cutting using Inkscape.

1. Select an Image for DXF File

The first step is to find the image you want to laser cut. This can be in any format. However, it works best with pictures that have a strong outline. For this example, we shall use a mortarboard in Figure 1 below:

2. Edit Image Layers for Laser Cutting Guide

Edit the image to ensure that the laser will cut out the right geometry. As highlighted in Figure 2, the mortarboard has a gap between the top and bottom parts: 

This is a problem when DXF laser cutting for two reasons. The first is that the Inkscape software will see this as two pieces of geometry and will cut out two parts, which is not what is required. Secondly, even if that was required, cutting lines too close together can cause the material to warp, so these lines need to be edited out as shown in the next image. This needs to be done before loading the image into Inkscape. Otherwise, the software will still register two parts even if it's drawn on in the software. Figure 3 below illustrates the edited image:

3. Import Into Inkscape and Trace Bitmap

Open the image in Inkscape via the “Open” button in the drop-down menu under “File” as shown in Figure 4:

Then, find the image you want to upload in your folder, select, and click “Open” as shown in Figure 5:

Leave the settings as standard and click “Ok” as illustrated in Figure 6:

The image should now be in Inkscape (Figure 7 below):

Using the “Path” drop-down menu, select the “Trace Bitmap” option as shown in Figure 8:

This will pop up in the Bitmap menu. The Bitmap traces the silhouette to make a line for the laser cutter as seen in Figure 9: 

Make sure the image is selected for the bitmap to work. Press “Apply” to use the Bitmap function. After using the Bitmap function, the silhouette will appear on top of the image as shown in Figure 10:

Make sure to move the silhouette off of the image and delete the image before continuing. Once the original image is deleted the silhouette will be left as illustrated in Figure 11:

4. Create the Bases or the Hanging Holes

You may want to create a hanging hole or a base for the final piece to be displayed as shown in Figure 12: 

To create a hanging hole, use the circle tool on the left toolbar. To create a perfect circle, hold Ctrl + Alt while drawing the hole. Alternatively, to create a base, draw the additional geometry as shown in Figure 13:

5. Making Page Orientation Changes To Enclose Base Design

Once you have used the Bitmap function to trace all of the geometries, you may find that they don't all fit on the page. To solve this, select all of the pictures and use the “Document Properties” function under the “File” drop-down menu. Then, select “Resize to content” to fit the page exactly to the geometry shown in Figure 14. This will save scrap. 

6. Exporting to DXF

Save the geometry as a DXF file using the “Save as” button in the “File” drop-down menu. Save the document as “Desktop Cutting Plotter (AutoCAD® DXF R14)” (Figure 15) and click “Ok” in the pop-up dialog box (Figure 16):

7. Importing the DXF File, Choosing the Speed, and Choosing the Power Settings

After importing the new DXF file into the laser cutting software, select the speed and power settings. Load the material to be cut into the laser cutter. Then, using your laser cutting manual, select the prescribed speed and power for the material type and thickness to be cut. Make sure the laser is also the right distance from the cutter. Finally, run the laser cutter and then put your cut-out material into use. 

Summary

This article presented the steps on how to create a DXF file, explained them, and laid them out with visuals. To learn more about DXF files, contact a Xometry representative.

Xometry provides a wide range of manufacturing capabilities, including sheet cutting and other value-added services for all of your prototyping and production needs. Visit our website to learn more or to request a free, no-obligation quote.

Copyright and Trademark Notices

1. AutoCAD® and Fusion® are registered trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates, in the United States.
2. Inkscape® is a registered trademark of Software Freedom Conservancy, Inc.
3. Linux® is a registered trademark owned by Linus Torvalds.
4. Adobe® Illustrator® is a registered trademark of Adobe in the United States and/or other countries.

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