If by "selected" you mean in the Machine Controls, then there is
no solution available, AFAIK.
Inside the job there no notion of "selected" nozzle. Nozzles are just used as needed, and often interweaved per job processor step.
What is your underlying purpose for this?
If it is related to axis motion, maybe this can help:
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> I was have bad idea when I started to make
mechanic-construction for PNP. Now I have Z Head with 2
Not a bad idea per se, some of the best machines have that.
> One solution is to connect this motors to one driver (with rotated coils) and work in mode: Nozzle pair, shared Zaxis, Negated.
No need! Driving separate axes is perfectly supported by OpenPnP.
You best set this up with Issues & Solutions:
Check Include Solved to get the "Create nozzles for this head" solution back.
Select option Standalone Nozzle and increase the Number of Nozzle Units to 2.
This will create all the right axes and nozzle axis mapping for you:
Then use Issues & Solutions to help you setup the
right axis letter assignment and G-code.
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>If this is coorrect way is this mean that this new axis must have own step_pin and dir_pin.
> It is not problem for me to make this correction on my controller, but which LPC1769 pin to use for this new axis.
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In order to use endstops on the Z2 = C axis, you need 6axis
endstops configuration. But please do not
follow the recompilation advice, our firmware is already
compiled as 6axis, just read about the endstops here:
Then look for homing_order
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