Remember, you asked for updates.
The insight for today was the Marlin firmware wasn’t tolerating the different styles of comments as I thought last week, it was simply discarding anything it didn’t understand. That got randomly weird in the dry runs so I hacked the Python code deeper and got a more acceptable result.
For stupid complicated Rhino geometry like this, DXF import is unsuitable. Pull it into Inkskape as an enhanced Windows metafile instead.
Attached is the fast etch identification markers and the internal cuts on 3mm plywood. In a word, perfect. I’m intentionally torture testing MPCNC to industrial machine tool standards just for fun. To date, I’m very impressed with MPCNC.