How can I set up different speeds for each extruder? Normally I use different materials on each extruder. And this materials need different speeds. Why is it not possible to set different print- and retraction- speeds in the expert mode?
I think it depends on what you are actually printing with the 2 extruders. Are you printing 2 separate STL files each with a different filament? Or are you printing a single part with some features that use a different extruder (such as using dissolvable support structures)?
Let me know what type of print you're doing and it will be easier to give instructions.