Yes I'm doing single walls with cura, same as S3D, i know people have differing views on which way to calibrate their printers for different filaments, but its also the same results when doing a double wall cube too, eg: when a double wall should come out at 0.8 its coming out at 0.9 and adjusting the flow in cura 4.6.1 doesn't do a thing!
Even though i have never had any trouble with cura 4.5 calibrating my filaments with this cube in the past.
This is the cube, calibrated at 100% flow rate.
Cura E3P Calibration Cube Single 0.4 Wall 0.4 Nozzle.gcode