72 of you have read this and no one has done dual extrusion yet? You guys know that I rely 100% on your knowledge before I can make any progress, right?
Kidding aside, I have gotten a little closer. I took a Marlin branch from whosawhatsis (thingiverse minimal-extruder fame) that he uses for a bukobot that purportedly had dual extruder support. Well, it turns out it partially does.
I went through config.h and set up the thermistor, PID, axis steps, etc... Uploaded, then told Repetier host that I had 2 extruders. All motors move in the right direction (including the second extruder motor (which I did invert the direction in Marlin)). There are a couple of issues and I think Roy (of Panucatt fame) is going to once again be needed to be the hero, I have an X3 board.
Two majors and a minor:
Majors:
1) The second extruder thermistor is not being read (in pronterface or repetier host). The physical wiring path is good, I can unplug it from the 2nd extruder pins and plug it in to the 1st extruder pins and temps start showing up in software. Could it be a software pins.h setting?
2) The second heater is not pushing juice. When I heat up the 1st extruder, I measure just shy of 12v at the X3 board (and the board lights up telling me power is flowing). When I try to heat the 2nd extruder there is no light on the board and I measure 0v (and obviously the extruder doesn't get hot)
Minor:
1) I've been using the 12v side of D5 to full time power my extruder fan. I figured I would be able to use D4 or D6 to power the 2nd extruder fan but no joy. Is that a pins.h change?
Edited to add: I see that I can plug one in to D4 but then I would turn it on/off in Repetier...
If anyone knows answers to any of these questions, feel free to tell me. I don't have to wait for Roy......