Wanhao D4S Extruder Cooling Duct

This is a cooling duct that simply clips over the 40mm fan of each extruder carriage. It's easy to install and remove if and when you need it. No additional fans or wiring required.
Screw holes are included if you want to make it a permanent installation.
You will need to reverse the existing fans to draw air over the heatsinks and blow down the duct. Print with something that can take a bit of heat as this sits pretty close to the nozzles.
Prints on it's back with no supports.