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Multiextruder issues

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I've been having some weird efects when using Cura 3.6 with my two extruders printer. I've two extruders but only one hotend, so currently I'm using only one of them at a time.

- First issue was when I was trying to print wit extruder 2 (Ext2) and 2.85mm filament. I don't know why, Cura introduced a long and very fast retraction just before printing the first layer. It started in 6 mm retraction at 100 mm/s and after some slicings the retraction growed to 18 mm. I have no starting gcode for any extruder.


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(Posted before ending the message, sorry)

I had to manual edit and comment or delete the wrong gcode retraction line. I fixed it uninstalling, clearing profiles and installing again. I found no other solution.

- Now, the Slicer has starting to activate the wrong layer fan. I choose Ext1, checked all the config and after generating gcode i've found that Cura is trying to start layer fan 2. I've only one fan and Ext2 is disabled. 

Why could be happening this issues? What should I check to avoid this unexpected effects?

I've starting to think that there's some kind of bug in multiextruder handling

Thank you

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That's probably because your firmware. Cura assumes that all commands it sends are for the active extruder. Some firmware has the (default) option enabled that when no extruder is specified with the command that it sees it at "do it for all extruders"

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