What is the darker area when using double extrusion

[redslifer 2]

Hi there. I noticed when using double extrusion on the edges there is a darker area. I think it shows you where the nozzle may run since there is the distance between each nozzles and it reduces the possible printing area.

But it doesn't explain why each profile has a different dark area, what is the setting which controls it?

[Smithy 1,146]

You are right, the dark area indicates the area which the print head needs and it reduces the available printing area. Not only dual extrusion limits the printing area, but also if you select the prime tower for example. Prime blob could also reduce the area, but I am not sure.