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Part information bellow,
NEW VERSION:
As many users have requested requested, the tip is now inclined so the air blows directly bellow de nozzle;
A full sleeve has been added to minimize the airflow loss beetween this part and the blower;
Better dimentions;
I've included the gcode I used on my CR-10 to print this part (for PLA only) in the file section as well as the STL of the new version.
This is an easy to mount cooling mod for the Creality CR-10, the other CR series and the Ender 3.
This mod redirects the fan air flow directly to the tip of the nozzle without being too big or obstructive. If you are looking for the best print quality this is definitely a must for your Creality…

I've owned my Ender-3 Pro V1 for 3 weeks now (as of this writing) and one of the first things that needed improvement was the filament cooling duct. The original isn't that bad but it doesn't blow the air where it's needed the most, concentrated below the nozzle. This is particularly important when printing overhangs and slim pointy objects.
Mistral-E design objectives:
Use with original fan that comes with the printer.
Blow high volume air on the filament just beyond the nozzle.
Avoid getting any cooling air on the heater block.
Designed to get the hot air away from the object as fast as possible.
Create a version that is compact and will not interfere with auto level sensors.
Reduce the noise level of the fan as much as possible.
Make it as light as possible to avoid high mass on the extruder.
Attention:
This cooling duct is intended for use with the standard unmodified Ender-3 or Ender-3 Pro printer.
It is recommended that the cooler be printed in ABS or PETG as these filaments are more heat resistant.
Pay…