In this tutorial we’ll show you how to unite and exclude your objects in Inkscape.
Making sure your objects are combined correctly is important for laser cutting. Using the Boolean Operations in the Path
menu, you’ll be able to combine shapes and cut holes in your shapes –
resulting in clean, closed paths. We recommend exploring these commands
in more depth on your own when you’ve finished this tutorial.
This is best explained by example. Let’s pretend you’re me and you
want your logo cut out on a nice little stand. You’d start with
something like this:
Looks pretty good, right? Well, before we get ahead of ourselves, let’s view our design in Outline display mode. I suggest doing this numerous times as you’re designing.
Uh oh, see all those overlapping lines? I see that I have multiple
objects all piled on top of one another. I also see a couple stray
points, an open contour and a line that isn’t connected. I’ll to need to
fix those issues before I send this file to the laser.
Fixing open contours
Before I combine my shapes, I want to fix that open contour, or broken path. Using the Edit path by nodes tool (F2), I will select the two nodes that I want to join. In the top tool bar I’ll click the Join selected nodes button.
Now that I have a continuous path I can merge my shapes. Using the Edit path by nodes tool (F2) again, I’ll select all the shapes. In the Path menu, I’ll select Union. This will merge all my shapes into one.
The example above was pretty simple, because I had already made use
of the Exclude tool. It seems like a good time to talk about that. The Division and Exclude
tools tool let you reverse one shape out of another while making it all
one object. For this example we’ll just look at the only the laser gun.
To start I basically have one gray shape, with white shapes layered
on top, where the holes should be. If I select all and apply black,
you’ll see that I don’t really have holes. I need to cut the white
shapes from the gray shapes.
Using the Edit path by nodes too (F2), I will select all my shapes. Back up to the Path menu, this time i will select Exclusion. The exclusion tool will cut the white shapes from the gray, creating one shape that i can send to the laser.
I’ll view my object in Outline display mode one more time and move my shape. This is to ensure the exclusion tool didn’t create any empty objects.
As always, before you export your file, go through the pre-flight checklist:
File is a two-dimensional vector format file. If you're designing in Adobe Illustrator, please send us your original .ai file.
File is built at a 1:1 scale, preferably in inch-units
All text has been converted to outlines or paths
Cut-out text (reversed text) has bridges or has been stencilized
All stray points, duplicate lines, empty objects and text areas have been removed
No shapes have open contours
All shapes have been united, combined or merged
All objects are on the same layer
All holes and cutouts are at least 60% material thickness