[FR] different E_factors in multi_nozzle_duplication mode

[Anarch-bit]

Is your feature request related to a problem? Please describe.

I am building a custom 3D printer for bioprinting or biomaterials (gels, etc....) and I am using co-axial nozzles with shell and core configuration. I am using a multi-nozzle duplication mode to operate the extruders the are connected to the co-axial nozzle and Marlin in this mode writes the same E factor (E0) for both extruders. The issue is that co-axial nozzles have different diameter sizes for the core and shell. So, my main problem is that if I apply a nozzle duplication mode to extrude both materials at the same time from the co-axial nozzle, the flowrate of both materials is different!! And, I want to adjust the flow rate of the core and shell independently. Does anyone know a way to have different E_factors while using duplication mode??
Note: Also, I can't make this approach work by the mixing extruder option as I have a combination of single nozzles with the co-axial ones. Overall, 4 steppers (2 attached to the coaxial nozzle and 2 other steppers where each one is connected to a single nozzle).

Are you looking for hardware support?

No response

Describe the feature you want

An implementation to write different E_factors in multi_nozzle_duplication mode.

Additional context

No response