How to set secondary nozzle Z-Offset

[drvertigo]

Hi All,

I have a custom dual extruder printer. The second nozzle is lowered to be below the primary nozzle, when needed.

So I need to set both a Z offset for the second nozzle (2.1mm)

How can I do this?

I am thinking some combination of Gcode in ToolChange Script might do the job, likely with a G92, but am unsure exactly how to achieve this.

Everytime there is a "T1", I need to lower the build plate by 2.1mm, and the opposite when there is a T0. Sadly it is not as simple as just "G91" "G0 Z2.1"

I need something like:
<on T1>
G91
G0 Z2.1
G90
G92 Z[currentZheight - 2.1]


Any suggestions?

Thankyou greatly.

[cinpro]

Have you tried a modifier like
G30 Z0.8 E0; extruder 1
G30 Z0.8 E1; extruder 2
then adjust from there based on results?