That's what I'm trying to do now, check my post if I figure it out I'll post the solution. Search FT5 dual extruder on thingiverse, theres a guy that has a carriage design with firmware. I designed my own carriage but I'm having trouble getting firmware to work. I do have the high temp part working, 24v heater, pt100 sensor, titanium heat brake, copper heater block, and steel nozzle, all E3d parts. I've been pushing some Ultem through it at 360c trying to find the right temp, my problem now is can't get my extruder motors to move.