Just in time for summer, it's a squeeze fan!
This is an adaptation of my favorite version posted on Thingiverse many years ago, updated for the speed of Bambu printers. You can download updated blades (and gears) if you want an even more powerful version.
If spinning too fast, the cover may separate from the case if the pins are too loose. Once everything is working well, I recommend a little glue on the pins to keep everything together.
The default print profile is everything you need on one plate in PLA. If you plan on using this regularly in the summer, I recommend using the second profile which has more infill, and used PETG.