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The place for the fan at the side of the board causes for me an unpleasent whine with a high pitch. A 40 mm fan is not enough. Completely without fan and open build they reach around 60°C. With fan on top of them around 28°C. No measurement with fan at side and closed case.
You see the same print in the image with closed case and fan (left) und open case and fan on top (right). There are a lot of small pauses which causes droplets and a generell uneven surface. The bottom is okay, but after a while it seems to get to hot in the case and causes the errors.
P.S.: I believe I set the V_ref for the TMC2100 to 1.2V (but need to measure again to be sure). With enough cooling the result is very good.