Case for PWM fan speed controller.

I created a case for a PWM speed controller, which I then used to control the speed of 4 fans to cool the solar inverter.The STL file has 3 parts due to the LED window that this controller has. That's why I also used transparent filament in the 3mf file. You can enjoy this smallest part or skip it completely. If you were to print with one dark color, remove this smallest part and you will have free space for displaying the diodes.For a tighter connection of the lower and upper part, I used an M3*12 screw + a nut. But it is not necessary, the parts hold together even without this screwing.