Need to test single extrusion and other infill settings, maybe it will be useful for others as well.
Notations on wall thickness.
Quick tip on calibration.
Find right temp first.
Print a single cube outline/corkscrew with extrusion multiplier set to 1.0.
Measure thickness and take extrusion width and divide by measured width and use as extrusion multiplier onwards.
Next run this model or other prints with flat top and pay close attention to how the top surface looks. If it has openings between lines increase infill extrusion width, if it is squishing out decrease it.