Pushing the poor little board to its limits. It smells funny and I managed to burn my fingers, but it keeps on trucking!
The stepper driver protests at these temperatures and stops moving the stepper for short moments.
The MCU reaches about 80C, which is a good thing, the heat transfer works as designed. I wish I had a FLIR to do some more detailed analysis.
It has now reached a good enough state and I am getting quotes for some minor volume production. Next step is to make a test-jig to be able to program and test the produced boards in an efficient manner.