Filling to a cut line & open shapes


I’m quite a beginner with Lightburn, and I can’t seem to figure out the right way to fill a shape to the border of the piece…

Here’s what I’m doing:

So, the fox should be as on the image on the left. In order to achieve that, I roughly designed some lines outside the cut shape and connected them to the “inner part” of the fox, so that the fill would go further than the cut line.

I have a cut line (Blue) and a fill line (black). As far as I can tell, the black shape is closed (it is not selected using “Edit > Select open shapes set to fill”), I checked the nodes at the connection points, and they “move together”, so…

Yet the preview feature tells me that I have 2 open shapes, and that these are removed for the preview.

  1. Is it possible to have open shapes set to fill not detected by the "select open shapes tool?
  2. How is it possible to have 2 fill open shapes when I only have one shape assigned to the fill layer in my design? Everything else is set to Blue (external cut - line) or red (internal cut - line)

Thanks in advance for your help,


Please share the .lbrn2 project file here so we can take a closer look.

Here you go:

arbre_soph.lbrn2 (140,3 Ko)

Well, solved it… The tree (line- cut) external shape was open on the bottom. I’m not sure why this messed with the fill on a different layer, but it now previews correctly. Thanks for taking the time to answer, if you have an explanation for the reason, I’m all ears

The blue line is interrupted there on the file I sent you:

1 Like

Sorry to step in.
Check this file need a bit of correction. but I have to leave now.
arbre_soph_1.lbrn2 (174.1 KB)

Odd — I see this break in your file, but I do not receive an open shapes warning when I go to preview it. In any case, I’m glad you were able to work out the issue. :slight_smile:

Why don’t you just increase the fox’ size by a few percent? Then the cutting line is inside the fill.

Well, the cut line is still going to be the fox’s boundary… but it is kind of what I did drawing lines outside.

That issue is fixed (now I’m spending my time on Fusion360 forum about another issue… :):slight_smile: