Anycubic i3 Mega-S Board Fan
thingiverse
EDIT: Also take a look at my new design which is a modular fan holder connected to the original screws and the SDCard-Reader-screw sockets: https://www.thingiverse.com/thing:4749832 Holder for a stepper-cooling fan (I took the 60mm fan with screws from my PSU since I replaced the fan in the PSU with a larger one). I attached the OpenSCad sources for easy customization (my Anycubic doesnt have a bottom enclosure, so the fan has enough room. It's an easy print. Just turn it on the flat side and add support from printbed only (probably will print without support too).
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