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thank you for feedback, yes, the part cooling can be improved as you have observed. i have also noticed that, ideally 2 fans - one left, one right should be used as in higher end printers, but with the smaller 20x20 or 30x30 form factor, but those are not so easy to source (specially the 24V versions), so decided to stick to the standard, easy to find everywhere 40x40mm type. But there's not really space for 2x 40x40mm , i already looked at that, so started to experiment if I should change the existing shroud cooling profile, to wrap more around the nozzle, or split into 2 paths.
will post update if this progresses to something that is actually functional and useful