I just installed a second extruder to my printer and have all of the hardware, firmware, and software setup and printing. I used Cura for slicing and have successfully printed my first print. The only real oddity is that the print temperature seems to be all over the place. It appears that Cura is doing auto temperature even though I don't have that set. It changing the temperature of the extruders anywhere from 175C to 210C. I know it's intentional because I see the target temperature changing.