View source for Calibrate KLipper extruder step-distance

==== Preparation: ====
# Mark the filament 120mm before the entry to your extruder.
# Heat up the nozzle to your desired printing temperature.
# Home all axis to get in "printer ready" state.
# Move the nozzle 50mm away from the bed to make room for the filament that will be extruded in a moment.
# Execute the following G-commands one by one.
#* '''G92 E0''' (resets the "extruded material" value to 0.)
#* '''G1 E100 F100''' (extrudes 100mm filament with 100mm/min.)
# Now measure the distance between your extruder entry and the mark on your filament.


If it is 28mm instead of 20mm (120mm - 100mm) than you are UNDERextruding by 8mm ==> 92mm instead of 100mm. If it shows 15mm than your are OVERextruding by 5mm ==> 105mm.

==== Now calculate: ====

c := current value in configuration.cfg<br>
m := measured left over filament<br>
d := desired mm<br>
n := new value for configuration.cfg<br>

  ((120 - m) / d) * c = n<br>
  ((120 - 28) / 100) * 0.010500 = 0,009660<br>
  (92 / 100) * 0.010500 = 0,009660

As you can see, for underextrusion the new value is lower than the old one.
You may play around with the last two numbers to fine tune.



* https://mattshub.com/blogs/blog/extruder-calibration
* https://docs.google.com/spreadsheets/d/1AWBTYIDA7LRxIdVeTuUnIcgW5g1HijDb/edit#gid=627601536
* https://github.com/KevinOConnor/klipper/issues/934#issuecomment-714438327