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on this model, the top side of the shroud (right above the outer-most holes) make contact with the black plastic part of the extruder assembly, which forces the fan shroud to angle downward when you try to make it flat against the heatsink. if they were notched in a little, it would be a perfect fit.

also the shroud itself has 13 holes, while the idea for improved cooling is there, i don't think the stock fan is able to push enough air through all the holes for efficient cooling. if it were reduced to 5-7 holes, i'm thinking it would improve the flow of air that should be directed at the nozzle.

minor issue about the fan wire not reaching all the way, but it was only held back by a black zip-tie. carefully snip, easy fix.

remix, or update?