I printed succefully with left extruder, I don’t know if it is a repetier host bug or its normal use.
To print with left extruder (extruder 2) I had to set extruder 2 in manual control (by default it is extruder 1) even if my object has been setting to extruder 2.
And in slicing menu, I need to set my filament settings in extruder 1 because repetier ignore completly my filament settings for extruder 2… it is always take settings from extruder 1.
I google this issue but didn’t find anything about extruder setting bug.
In other post, someone talked about zim firmware bug about dual extruder… I don’t know if it is same problem.