How to calibrate the filament flow ?

This is an important step for the print quality.

We are printing in vase mode a single perimeter of a cube on 20mm height to evaluate the layer width.

Open the slicer and import the 100mm cube given in the examples (100 because it is long enough for the extruder to reach a steady state)
Load your default profile
Set the temperature
Set the extrusion flow to 100%
Set the extrusion width
Disable the cooling ( min print layer time to less than 5 seconds)
Set the print speed about the print speed you want to print
Enable the vase mode
Disable Top and Bottom layers
Ensure the infill is set to 0
Slice from 0.0 to 20.0 mm
Launch the print
Once the print is finished, use a caliper (or better a micrometer) to check the value of the extrusion width of the single printed wall in different places, and iterate adjusting only the extrusion flow until the extrusion width is correct.
Optional : Check the length on both X and Y, to see if there are deviations for your calibration on X and Y
You can iterate with 2 or more perimeters, then adjust accordingly to your profile