Cool! Thanks. I haven't worked all that much in PETG. The few times I did, it seemed more brittle. I think if you have any broken teeth etc, you might try going up to 3 wall lines.
It is awesome that you were able to design that in FreeCad. I use OpenSCAD but have tried FreeCAD. For some reason, the design process in FreeCAD just doesn't click with my brain and I always struggle with it. Plus I have experienced many crashes which discourages me.
Anyway, keep up the great work!