I'm on a mission to reduce the amount of noise my LulzBot Mini 3D printer makes. I've already added a motor damper to the Y axis.  However, one thing that is consistently noisy is the case fan.   It's on at > 70% nearly all the time.  In addition to this, the air vent fins in the side of the case amplifies the fan noise.  So, I decided to build my own fan controller.  …
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