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:
Black mortarboard.
Gap in Mortarboard
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:
Edited Mortarboard
Inkscape Canvas
Then, find the image you want to upload in your folder, select, and click “Open” as shown in Figure 5:
Inkscape Open Folder
Leave the settings as standard and click “Ok” as illustrated in Figure 6:
Inkscape Dialog Box
The image should now be in Inkscape (Figure 7 below):
Mortarboard in Inkscape
Using the “Path” drop-down menu, select the “Trace Bitmap” option as shown in Figure 8:
Trace Bitmap
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:
Trace Bitmap Applied
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:
Delete the Original Photo
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:
Silhouette
Hanging Hole Edition
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:
Base Edition
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.
Resize Document To Fit Geometry
Save the File as DXF