There is a small rectangle of layer 0 covering the bottom half of the inlet (blows to the part) that you need to punch/cut out after printing. It prevents supports being generated inside the duct. However you should not need to use any supports....so it's sort of redundant.
My heatbreakTube is longer than usual. So this shroud will be several millimetres too low for the standard heatbreak tube (it will hit the bed before the nozzle if you use it on the standard i3 mega's setup).
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