I cannot figure out which flavor of controller board my red mpx.3 is either.

Tom's Guide has a tutorial about how one can set up a proximity sensor for use with an aluminum heat bed, but I'm hesitant to flash my firmware with the required changes without knowing specifically what board I have.

Is this similar to yours @GATJ ?

20160228_125141.jpg

I'm having good luck with the printer as well, btw.