I used this controller to modify my Printrbot Metal Plus 3D printer and it works great! I set it up to regulate the voltage between the secondary 24v power supply and the external power management module which now controls the printer bed heater. Basically, it was an easy way to "pull up" the voltage to heat up the platform faster (MUCH faster!) without overloading the heater board. Had to fiddle with the PWM switches to get it working, but it works! Good product!
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