Creality Ender 3 Fan Duct

thingiverse

This is a small cooling duct for the original fan that comes with the Ender 3. You just need to remove the original fan duct and put this one in its place. Ideally printed from PETG as it sits very close to the hot end, but my PLA one has not melted even printing PETG for 8h. As the channel through the far side of the duct is very small, it's important that the printer is not stringing, or you'll end-up with uneven airflow. Probably only works with the original hot-end as it's touching the padding around it. If you've removed the padding, I recommend wrapping the duct in kapton tape to stop it from melting. Hope it's useful, as it's been working well for me.