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UM3 flow rate affects both extruders

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It's intentional. There was another thread, which I currently can't find. @Daid, which I think is the head firmware developer at Ultimaker HQ, said that this was by design. Cant remember the reason :|  

Why do you want to change the flow rate anyway? Personally I'm not a big fan of those live adjustments. I would do some tests before and change the flow in Cura according to your material. 

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There is no UX reason. It's actually tracked as a bug in our system. The reason is legacy, we are still building on top of the old Marlin which does not support flow rate per extruder. Priorities prevented it from fixing it so far.

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