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  1. You can feel it with your hands touching the housing of the control box.

  2. My fans have integrated temperature sensors. I atteched them right beside the power switch inside of the box. This is the hottest spot in the control box. The fans run with half power when temp. is below 42°C and turn up to full power when temp. reaches more than 42°C. Actually I only heard the fans turning on full power, when I heated them up with a hair dryer, just to see if they work as supposed.
    In the normal printing process I never recognized that the run at full power.

So....yes, I know that it stays MUCH cooler.