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• Load Filament (bright color recommended)
• Find out M92 E esteps with M503
• From base of extruder, mark point at 120mm/12cm
• Set local coords and extrude 100mm@1mm/s

  M83         ; E relative mode
  G1 E100 F60 ; Extrude 100mm @ 1mm/s (60mm/min)
  

• When extrusion finished, measure from base to mark.
• Calculate new esteps using previous measurement $x$: $E_{new} = E_{orig} \cdot \frac{100}{120-x}$
• Set new value with M92 (ie. M92 E421).

G28                        ; home
G0 X[x offset] Y[y offset] ; move to proper bed origin
M428                       ; set current pos as bed origin
M500                       ; write to EEPROM