How to Calibrate E-Steps on Your 3D Printer

E-steps (extruder steps per millimeter) is the firmware value that converts “move the filament 1 mm” into “turn the extruder stepper motor this many steps.” If it’s wrong, every extrusion command in every print is scaled by the same error, no matter what the slicer asks for.

What you need

• A permanent marker
• A ruler or, ideally, calipers
• A way to send G-code commands to the printer (the printer’s own menu, or a host like the one built into your slicer or firmware’s web interface)

The measurement

1. Heat the nozzle to your filament’s printing temperature so it can move freely (you’re not extruding onto a print, just testing motor movement).
2. Mark the filament 120 mm above the extruder’s entry point and note the current E-steps value from your firmware settings.
3. Send a command to extrude 100 mm of filament at a slow, controlled speed (in G-code, something like G1 E100 F100, adjusted for your firmware’s syntax).
4. Measure the remaining distance from the extruder entry point to your mark. Subtract that from 120 mm to get the amount actually extruded.
5. Calculate the corrected value: new E-steps = old E-steps × (100 / actual distance moved).

For example, if your old value was 415 steps/mm and only 94 mm of filament actually moved instead of the requested 100 mm: 415 × (100 / 94) = 441.5 steps/mm.

6. Enter the new value and, if your firmware supports it, save it to permanent memory (commonly M92 E<value> followed by M500 on Marlin-based firmware — check your specific firmware’s documentation for the exact commands).
7. Repeat the test once more to confirm the new value produces a measurement close to 100 mm.

When to redo this

E-steps is a property of your extruder’s mechanical setup — the gear ratio, the stepper motor, and the microstepping configuration in firmware. You generally only need to recalibrate it after:

• Replacing the extruder, hot end, or drive gear
• Changing microstepping settings in firmware
• Noticing consistent, direction-independent under- or over-extrusion across multiple filament types (a symptom that points upstream of flow rate — see under-extrusion vs. over-extrusion)

Switching filament brands or colors doesn’t require re-checking E-steps — that’s what flow rate calibration is for, since it’s tuned per-filament rather than per-printer.