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I've changed the extruder fan to a A4x10 with no issues. I also removed the metal obstructing air flow to both fans on the extruder.

And changed the horrible motherboard fan.

And finally the PSU fan to a thin Noctua 90mm fan but that depends a bit on what PSU you got, Anycubic seem to ship different PSUs over time...

What a difference it is!!!! :-D