Lulzbot TAZ Fan Dual Duct with Tap ready holes by Makuna

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.

Download from thingiverse