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Download this calibration cube created specifically for this test from Thingiverse:

Using the slicer of your choice, slice the cube with the following settings: 0.2 layer height, 2 perimeters, 0% infill, 0 top layers, 0 bottom layers, 30mm/s inner and outer perimeter speed, 100% flow rate/extrusion factor, extrusion width = nozzle width. Use a wide brim as well to ensure adhesion.

Let the print progress for several layers to allow any first layer inaccuracies dissipate.

When the print reaches 10mm z height carefully check for the separation of the 2 walls. Ideally, the walls should be fused together with no gap between them. Under extrusion will show as a gap between the walls, and over extrusion will show as messy walls or an uneven, rough surface.

Use the extrusion factor slider in the DWC to lower the extrusion factor by 10% and observe the print for a few more layers. Keep reducing it until you can definitely make out a gap between the walls. Then increase it again until you notice the gap disappear.

Keep adjusting the extrusion factor up and down until you find a value that looks best. You can now modify the slicer extrusion factor to use this value. So if 98% looked best, use 98% (or 0.98) in the slicer. If 105% looked best, use 105% (or 1.05).

The benefit of this method is that you can get the extrusion factor dialed in with a single print rather than printing it multiple times with slight changes each time.

You can even use both methods to verify that you're on the right track.

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