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80mm Fan Shroud
I printed this using sli3r with a .4 nozzle and 2 perimeter wall thickness. It has built in support that you can cut away with a pair of wire snips or similar tool. There is still blow back but provides much more focused cooling at the nozzle than the stock 40mm fan.3D printer parts and enhancements
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You may have to adjust the position of the extruder. I mounted the shroud so there is about a 5mm distance from the tip to the nozzle to the lowest part of the shroud. If you adjust the position of your extruder, make sure to take precaution and set your z offset so that the extruder doesn't crash into the bed. I'm using a 12v .14 A 80mm fan which now responds to fan speed settings below 100%.
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