Extruder External Mosfet Power Board

This is a board that allows you to power a Mk4/Mk5 Plastruder, Heated Build Platform, etc. using external mosfets (and an optional relay). It can be directly connected to a stock Extruder Controller without any modifications. The input lines connect to the '-'(GND) terminals on the EC.

After already burning out one EC mosfet, and hearing that you might need to use a relay board to power the Mk5, I finally decided to design and build this board. The IRF520 mosfets I used in the prototype shoul