Case for 12V PWM Fan controller (ZFC39) remix

There is a good explanation of this controller at: 

I remixed MyStoopidStuff's case to make all of the holes self threading into the plastic for M3 bolts, a smaller hole for the power outlet to match the ones I had, and an extra hole for a 100k pot that I wired in parallel with the 50k thermistor for finer control over the fan speed and temperature range of the ramp.