The position of this fanduct is adjustable in all 3 axes, so you don't have to change the height or orientation of the hotend when mounting it.
It has an open side for better viewing through the webcam.
The fanduct is designed for a radial fan with an air outlet with inner dimension of 17 x 13mm.
I don't know anything about air flows, but if I got the physics right, the air streams will meet about 8mm below the bottom of the fanduct (I blew through it with an e-cigarette and it looks about right). That way you can mount it a little higher, which means less print destroying mess when filament gets stuck on it.
The model is printable without supports, if your printer and slicer is tuned properly for small bridges.The model already has custom supports in the air holes, which you have to break out after printing.
2 M3 screws are recommended to connect bracket and fanduct. Though 1 M3 screw may be enough.
A Fusion 360 file is available for modifications.
You can print it with PLA. Just make sure each side has an equal distance to the hotend. If a side touches the hotend it will melt.
3D Freunde PLA
The model has custom supports which you have to break out after printing. Do not turn on supports in your slicer.
See the Cura screenshot for proper print orientation.
Make sure that the direction of the top/bottom pattern of the shell makes it create short bridges. In Cura you can change the direction through the settings. Otherwise just rotate the model in your slicer to make it create short bridges. If it creates long bridges the walls will probably have holes.