I am running into a few issues though.. maybe someone here can help?
My parts have 'folding lines' and cutlines and I can't find a way to get them cut in a single line yet.
I am creating them as the 0,2mm thin slots in the shape, so that path will recognize them. In the tool settings I am using a mill with 0,2mm diameter (the beam diameter of this CO2 laser in focus). Now I was hoping that "use compensation" in the Tool Controller would do the trick, but it will just dismiss the slots. So far it only runs 'around' the inner lines when unchecked as in the attached screenshot.
Edit: I just found the engraving option where I can select single edges for engraving/cutting.. that could to the trick

Here's my info:
OS: macOS 10.14
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15305 (Git)
Build type: Release
Branch: master
Hash: 4d4f0162776b80f9740ef129536d8ba85ea72f73
Python version: 3.6.7
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)