Replacement for the stock Improved CR10S Pro part cooling fan duct
File types:
.stl - Ready to print
.f3d - Editable Fusion 360 file - Includes a 3D scan mesh of the stock fan and extruder
The author remixed this model.
Used the attachment concept from salva65's fan duct, but I have increased the duct cross-sectional area to improve air flow.