Wanhao I3 V2.1 Fan Duct

Update 3 - moved the fan up higher to clear the cabling going to the heat bed. Tested and working perfect now. Note the M4 bolts has changed to 30mm long.
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7:22 pm Update to design, made the duct bigger as it was pushing too much air out the back.
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This is my take on the Wanhao fan duct. This is to move the cooling fan from the front to the back using the same fan.

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