Helllo !
Cor that sounds like you are both battling wiring, emough to give up and start again..
My 3d printer has a nice board that'd have more than enough on it to drive an engine, just a dream for now but always in mind..! Mega 256 and a Ramps board.. 2xhigh current outputs.
Can i guess (before I Google) is a mega-squirt arduinio based.?
I've been playing with Matt this week and a few times said how great it'd be to make one.. touchscreen tft editing and monitoring isn't that much effort either..
Cool, if i win the lottery I'll pay you as consultants!!
:-)
Neal