Geeetech E180 25mm to 40mm fan adapters
thingiverse
Update: I decided to go with 30mm sunon maglev fans. The 40mm fans weren't cutting it with airflow. I was getting heatcreep half way into a benchy. https://www.thingiverse.com/thing:3639750 The stock fans were wayyyyyyy too loud, so I replaced them with some 40x20v noctua ones.
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