I have underextrusion at internal printing parts. I checked the mechanics, calibrated the extruder and also made a comparison test with another slicer. In my opinion, this behavior must be due to some setting I made in Simplify.
First and top layer as well as the outer walls are good, only in the inside there is underextrusion. The first few layers are printed correctly but from a certain height the problem starts. I have the feeling that it starts after the "Top solid Layers" are printed. In the area where infill should be (here infill = 100% = solid) I get underextrusion.
Here is a picture of a aborted test print and my settings. Has anyone ever had something similar?