And a note:
In relative mode the extruders (defined as tools) work perfectly and correctly (this is standart printer mode). However, I need the absolute one and I think - there was no issue because of no use of this mode.
@dc42 Hi David, I saw a comment that you are ready to help with integrating the DUET 3D to the other maschine like Pick and Place. My vision is to sell this maschine like a Prusa printer. However, I need to solve how to use two nozzles - now only one is working. Thanks for any help.