I changed to a .8 two nozzle width wall based on another research projects test results and that Cura choked on my .4mm original cube.
So now its an .8 wall test cube
This is still relevant just adjust to .8 from .4
With this method any filament used will then be tuned with the flow rate to optimal extrusion using a 2 shell wall test cube. Print the cube at .80 2 wall, then measure and record 2 values from all 4 sides. Add them together and divide by eight. Divide .80 by the resultant, and multipy that by 100 to give your new flow rate or extrusion multiplier. Example test cube measurements avg to be .828 so we take .8/.828 which equals .9661x 100 = 96.61or 97% flow rate as your new value. Note: if you had already been using a flow rate modifier, you would be at that % of the rate you were using. Example was at 97% and the calculation comes to 92%. That’s 92% of 97% or 89% , 97 x.92 is 89
Use calipers to measure and record 2 values from all 4 sides.
Add them together and divide by eight.
Use this average for next step.
Divide .80 by the AVG that was previously established.
Multipy that by 100 to give your new flow rate or extrusion multiplier.