I'm using a pololu and carrier to drive the extruder on my mendel. I didn't have a good place to mount it so I made this little bracket to mount it over the extruder board. It leaves enough room for good air flow and to reach the ttl header, reset switch and to turn the screws on any of the other terminals.Print it and clean up the holes if needed. Mount the pololu carrier board on the inner holes. I used 3mm screws and small nylon stand-offs because I had them. Mount the bracket over the extruder board. You'll need longer screws to go all the way through the bracket, extruder board, and whatever surface you're mounting to. 40mm worked for me.