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Have not yet changed the speeds as I just saw your post. Swapped the Arduino back to the new one with the current firmware.
Now with a full power cycle on the electronics and restart it prints what appears to be perfect.
The hardware incl. timing belt is exact to 1/4mm (hardly measurable with a digital caliper).
Testing more now. The machine does not vibrate hardly at all and runs very smooth. First test 3d print is nesting washers where the outer diameter of the inner one is the inner diameter of the next one. 4 of them stacked perfectly inside each other.
We are making progress.
For the record – all parts, service and support provided by Vicious1 have been nothing but great. Thank you.