Been looking around a while for a better fan duct for my Ender 3 Neo, but no one really seems to have made any. Finally built up the motivation to do it myself. Using the model made by Geazzes walking of the single fan duct, I was able to put this one together. It's most definitely not perfect, but it seems to do the trick.
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I don't know if this will fit with the stock fan shroud, but if you are interested I am using this one by Ihor Pomaranskyy
The author remixed this model.
Used Geazzes' model to create a dual fan duct version.