Fill between two objects

[1Vince (vince mastrosimone)]

I have a project that I have done on my CNC router that I want to do with acrylic on my ortur. Here is the item.

I want to fill between cross and the circle. On the router, I just did a pocket cut. I can’t seem to stop the fill on the cross. Can anyone help?

[Rick (Technical Evangelist)]

@1Vince

I can’t seem to stop the fill on the cross.

I do not understand this, unless the cross is not a closed shape. As you can see in the following, LightBurn uses ‘boundaries’ to define what gets filled.

How do I invert (negate) a vector engraving?

If you want to invert a vector engraving (Fill layer) you need to add an outline to it. Think about what happens when you scan a circle, compared to the letter ‘O’. The inner ring of the O toggles the fill. If you add another shape (like a square) outside it, it negates the whole thing: [image] And a slightly different example, this time done by changing the outer line around the design to a ‘Line’, instead of leaving it as part of the Fill layer: [image] In the case above, the design alr…

[LightBurn (Oz)]

First, make sure the cross isn’t duplicated - if it is, the dupes will cancel each other out when filling. Edit > Delete duplicates.

If that doesn’t do it, then make sure the cross is actually a single closed shape, not several disconnected lines. Select the cross, un-group it (Ctrl+U) then try the “Auto Join” feature - Edit > Auto-Join selected shapes (Alt+J) to see if it connects things.

[Rick (Technical Evangelist)]

To illustrate…

Why do things disappear when I fill them, but not when I cut them?

If you have shapes that vanish when scanned, it’s almost always because you have doubled-up shapes, sitting exactly on top of each other, and they’re cancelling one another out, like this: [image] Notice the last pair of circles disappears completely in the scan preview? Make sure your shapes aren’t grouped (you can tell because the selection pattern will be just simple dashes if the shapes aren’t grouped), then use Edit > Delete Duplicates to find overlapping shapes and delete them. This s…

[1Vince (vince mastrosimone)]

Thank you all for your help. I tried the outline method and it worked perfectly.