Quick and easy way:
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Preheat hot end to your normal printing temp.
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Mark 120mm away from the entrance to the extruder on your filament.
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Go in your printer settings to prepare → motion → move axis → 1mm (10mm if it’s an option) → extruder.
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Move this up to 100mm exactly. Don’t go past it, don’t make the knob go in reverse. 100mm is key.
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It will slowly extrude what it thinks is 100mm. It likely will be a bit off.
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Measure from the extruder entrance to your mark. Ideally it should be 20mm (120mm marked - 100mm extruded). Let’s say you measure 25mm instead for example.
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Your actual extrusion is 120mm minus whatever you measured in step 6 (my example was 25mm remember). In this case, actual extrusion would be 95mm.
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(desired extrusion) / (actual extrusion) = correction factor.
(100mm) / (95mm) = 1.0526 -
Go into your printer settings again and find control → motion → and find the default esteps/mm value your printer is set to. I think the default is 92.6 esteps/mm.
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Multiply your machine’s esteps/mm by the correction factor from step 8.
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MAKE SURE YOU HIT STORE MEMORY