***First off i strongly recommend printing the XYZ calibration cube with no in fill and no top layer to calibrate wall line calibration as well as measuring your filament***
This is a Step extrusion multiplier test printed from 2mm to 6mm. You will need some cailpers (if you have 2 this would provide a more accurate reading).
Measure each step, which will help determine the extrsuion multiplier required.
To work out the multiplier the formular is very straight forward take the measure it is suppose to be and divided by the measurement reading eg 3÷2.62 =1.14503186 or 1.15+/- However as Calibers can vary in measurement i would measure all 5 steps and the take the average and use that to do the extrusion multiplier.
***This is only an advisory for most beginners, if your width and height is not more or less the same the height then you could have the bed to hot or your bed is not at the right height***