Repetier won't print to second extruder.
I finally got to print with the right extruder last night (once). Every slice (with sli3r or cura) goes to the left extruder. #2 is selected in the Object Group menu, slic3r slices it and shows the #2 filament color but when printing #1 (and only #1) is heated and tries to print with that. Cura won't even change the filament color in Print Preview menu.