View source for Calibrate KLipper extruder step-distance

==== Preparation: ====
# Mark the filament 150mm 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 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 58mm instead of 50mm (150mm - 100mm) then you are ''UNDER''extruding by 8mm.  This make E = 92 mm in the formula below.<br>
If it shows 45mm than your are OVERextruding by 5mm. This makes E = 105 mm in the formula below.

==== Now calculate: ====
E = measured length of extruded filament.<br>
d = desired/expected length of extruded filament.<br>
C = current step_distance.<br>
n = new valu for step_distance.<br>

'''n = (E/d)*C'''

  (92 / 100) * 0.0105 = 0.00966
  (105 / 100) * 0.0105 = 0.011025

==== Or use this App ====
  https://studio.code.org/projects/applab/7Mz-Jt-Gy6HG5veaWxx5j9Zz0w_6pDnEqFoxZPUYCec

==== Notes ====
For underextrusion the new value is lower (0.00966) than the old one (0.0105), and for overextrusion it is the opposite ;-)

__________________
* 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
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