There are numerous brackets for standard axial fans on thingiverse. I'd recommend putting the printer on some feet or vibration dampeners to increase the fans' ground clearance. Axial fans need much more clearance in front of them than radial fans in order to get a good airflow going.
Or you could of course take some DC motor and print a radial fan for it. I thought about that but haven't gotten around to do it yet - too much other stuff waiting in the line.
If you've ever analysed the fans in a PC case and noticed the front fan isn't actually making much more than just a lot of noise - it's the same thing...
This was happening to my fan; I assumed it was mechanical failure. In my case, it turned out to actually be an electromechanical failure - one of the power wires was frayed where it entered the fan. Resoldering brought it back to new. Also oiled it a little.
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