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We initially tuned the extruder flow by setting the rough E steps per mm value. Now we can fine tune the extrusion rate in the slicer for each filament type we wish to use.

Each slicer calls it something slightly different. Slic3r calls it extrusion multiplier in the filament properties tab. Cura calls it Flow rate %.

For best results, you will need to make slight adjustments to it for each type of plastic and even sometimes between different rolls of the same brand and type. If your E steps are correct and was measured with filament similar in diameter, a value of 100% or 1.0 may be correct.

The first step is to provide the slicer with an accurate dimension for your filament. The nominal diameter for typical filament is 1.75mm, but in actual practice, it can vary quite a bit. To accommodate this, the slicer allows you to specify a more accurate measurement to use in its calculations.

To do this, use a caliper to measure your filament diameter in several places over a few meters worth and in at least 2 orientations rotated by 90 degrees (in case it's oval and they all are). Use the average value as your filament diameter in your slicer. 1.68 to 1.72 has been the most common diameter in my experience.

Usually measuring the start of a new roll is enough, but sometimes it can vary throughout the roll, so it may be beneficial to measure before each print.

Next, we will use an actual test print to help us dial in the extrusion multiplier.

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