1. Use calipers or a ruler to measure 100mm along the filament from the extruder opening and make a mark on the filament with a permanent marker
2. Use calipers or a ruler to measure 110mm along the filament from the extruder opening and make a mark on the filament with a permanent marker
3. Use calipers or a ruler to measure 120mm along the filament from the extruder opening and make a mark on the filament with a permanent marker
4. Heat the nozzle to 200C
5. Move the Z axis to 50mm
6. Extrude 100mm of filament
7. Use calipers or a ruler to measure from the extruder opening to the first visible mark
   1. If all three marks are visible then it is under extruding so subtract the value measured from 100 to get the actual extruded length
   2. If only two of the marks are visible then it is over extruding so subtract the value measured from 110 to get the actual extruded length
   3. If only one of the marks are visible then it is really over extruding so subtract the value measured from 120 to get the actual extruded length
8. Calculate the new extruder steps
   1. New Steps = (100 / Actual Length) x Current Steps
9. Change the steps value

1. Clip a piece of paper to the build plate
2. Move the X carriage to a location over the paper
3. Attach a pencil to the X carriage with a rubber band
4. Move the X carriage 100mm in the X direction
5. Move the X carriage 100mm in the Y direction
6. Move the build plate 50mm in the Z direction
7. Measure the length of both lines with a ruler or calipers
8. Calculate the new steps value
   1. New Steps = (100 / Measured) x Current Steps
9. Change the steps value

This procedure is based on This Link

Follow the steps for Calibrating Temperature

Follow the steps for Calibrating Retraction Distance

Follow the steps for Calibrating Flow Rate