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This is what I use for cooling and it works very well


This also does not block your view

Then I modified an LED mod to this

All printed in PLA
lots of print time on these so far, no issues.

I would also do all the other things that re recommended by others int his thread.

Also keep in mind that Every Roll of filament may/will act slightly differently.
You will need to adjust based on each roll
there is no "one settings fits all" mode.

WANHAO i3 Fan duct
by Thorped
i3 v2.1 thorped fan adapter
by ellioal