Hello,
I hope you are fine 
I am trying to cut windows (should be blue) and engrave a mosaic (should be black)
But mosaic is sometime considered as cutting and cutting is considered as engraving 
I hope my file is not messed up 
https://drive.google.com/file/d/1m7t65moXmjnScZSU1LIKQKlRhwfTzYsJ/view?usp=sharing
Faber V1.1.1
Sketchup Make 2017
Tool : 0.0393700787 (1mm)
I think what you’re running into is that we really only support 3D objects… That is, your engraving cut I’m assuming is something that you want to use a V Bit and cut directly on the lines that make up the window.
For Fabber to pick those up you’re going to have to use Push Pull to make some pockets out of those windows, that way when the model is scanned we can see the height difference in the faces and make a toolpath.
That toolpath will be an “INSIDE” toolpath, but you can just change the layer name in Illustrator, Inkscape, or your laser cutting software if you want.
