Hi guys, I realize that this thread might be a bit old now, and that you probably have figured things out. But for the benefit for future Googlers, I'll give my solution to this. I had the same problem when using Repetier Host. It turned out that there is logic in the software that prevents the extruder to move when the extruder heater is not hot enough. I have not checked the software for whatby arvelarve - RAMPS Electronics