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Measure all the perimeters of your cube and calculate the average.

Calculate your new extrusion multiplier using the formula on the second image. Here is an example:

Your original extrusion multiplier = 1.00 and your average perimeter thickness = 0.441mm.

Your are using a 0.4mm nozzle, so your target/expected extrusion width is 0.45mm.

Your new extrusion multiplier = (1.00 · 0.45)/0.441 = 1.02.

Enter the new extrusion multiplier value in the filament settings page of PrusaSlicer.

Print the part again to verify the value is correct. Repeat the previous steps if necessary.

Tip: The extrusion multiplier is generally constant for a whole spool (if you do not change temperature) but the filament diameter will change. Therefore, before slicing a part, measure the filament diameter you are going to use and enter it into PrusaSlicer.

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