Calculate new e-steps
Do the test below first, then enter your four numbers.
Tools
E-steps calculator
Measure how much filament your extruder really pushes, then get the corrected value for Marlin or Klipper.
Free tool · no signup
Run the extrusion test
Heat and load
Load filament. Heat the hotend to its printing temperature.
Mark and measure
Mark the filament about 70 mm above the extruder intake. Measure from the extruder body to the mark with calipers.
Extrude 50 mm slowly
Send G91, then G1 E50 F60, and wait. It takes about 50 seconds, and the slow rate matters, so skip the extrude button on the printer's screen or in a web interface, which pushes filament far faster.
Measure again
Measure from the extruder body to the mark a second time. The difference between the two readings is what it really extruded.
The formulas
Marlin: new steps/mm = current steps/mm × requested ÷ actual. Send M92 with the new E value, then M500 to save it.
Klipper: new rotation_distance = current rotation_distance × actual ÷ requested, rounded to three decimal places, per Klipper's calibration guide.
The two move in opposite directions. Steps/mm counts motor steps per millimeter, while rotation_distance is the millimeters of filament per motor turn.
Common questions
Klipper's guide warns that a fast rate builds pressure in the extruder and skews the result. At 60 mm per minute the hotend keeps up.
On Marlin, send M503 and read the E value on the M92 line. On Klipper, it is rotation_distance in the [extruder] section of printer.cfg.
E-steps first. It fixes how much filament the extruder pushes. Flow rate then fine-tunes how much each filament needs.