An accurate print requires the accurate flow of plastic from the extruder. This is controlled by the number of motor steps it takes to move 1mm of filament through the extruder. The default value for the Ender 3 is 93, (or 744 if you've chosen x128 microsteps as mentioned in the config guide). This procedure will test the accuracy of this value.
You will need a ruler or caliper, marker, filament, and calculator.
Overview of the procedure: We will mark a set length on the filament from the extruder body, then command a set distance of extrusion, then measure the resulting movement. The difference between requested and measured distance will inform the change to the steps per mm.
Your bed should be leveled and your heaters tuned before proceeding. See the earlier steps.
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