OB 1.4 50mm Backup Head Fan mount

This part is a backup fan for Hot end Heat sink.
It happens that each fan has a lifespan of a few 10000's hours.
After a while due to lifespan or dust or what ever else, your fans will start making some noise.
This is an indicator that your fan might get stuck in a near future and that you might need to oil the bearing or change your fan.
With full or half metal hot ends, the fan for the heat sink is MANDATORY. If it fail before printing, it's not a big deal you can change it before star