I would recomend you this posts:
https://ultimaker.com/en/community/view/3435-new-fan-cooling-design
https://ultimaker.com/en/community/view/3839-the-physics-of-cooling
https://ultimaker.com/en/community/view/4890-the-crossflow-fan-approach
In the end you would need a simetric fan or double fan but simetric or a crossflow fan. So yes the fan it's ok but isn't perfect. Even on um2 there's no simetry on the fans. What I did was redesign the head (for my magnetic head changer version) and now I have a very solid pla cooling. Still not perfect but much better.
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Dim3nsioneer 558
I assume you have an Ultimaker Original (it might not hurt to put that fact into your profile...
)
You may try to put a small tower to the right of your print. Like that the right side might get a bit more cooling from the single fan on the left...
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