For the rear fan you can look Here and find a suitable 5v fan for the correct size and flow if you want to go that way. depends on how old your UM2 is will depend on if it will turn on and off when it heats up.
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WiseOldOwl 7
OK...I'm here answering my own questions...LOL! Actually, I am putting info here for others.
I downloaded the Tinkergnome .hex file and updated the firmware using that through USB cable and Cura (Machine->Install Custom Firmware) - Wow! Fantastic!!! From the front LCD on the UM2 I am able to change steps/mm for any axis including the Extruder. I changed the value to 495. I'll verify the distance and direction proper soon.
I reused the E motor connector on the board since I didn't have one here. I do have a bunch of Molex MiniFit Jr plugs, so I put one on the board connector pigtail to connect either the original motor or the Bulldog XL. I always like doing things where I can go backwards if I don't like changes. It is more effort, but...
Copper fan shroud needs some tweaking as it will hit the glass before the nozzle. Nothing a few little bends here or there can't fix.
Nozzle heats up fine. I don't know how to PID tune yet, but will look into that later.
More later...
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