Lulzbot TAZ Fan Dual Duct with Tap ready holes
thingiverse
The only difference here is the holes for the fan are smaller. They are sized for a Tap (3mm x 0.50) that will allow the stock screws to be reused. Not as strong as press insert nuts but strong enough to hold the fan. If you have a Taz5 or the new Hexagon Metal hot end for your Taz4, then this modified fan duct is not needed as it has a separate fan that cools the hot end directly.
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