MAKERCALC
Manage

Voron 2.4 extrusion calibration (rotation_distance)

The stock Voron 2.4 rotation_distance is 22.6789511 mm per revolution. That is the starting point in its Klipper config — tune it once with the mark-and-measure test and the extruder tracks reality. The rotation distance & e-steps calculator does the correction math and prints the exact line to paste; the full calibration guide explains the test in detail.

22.6789511

stock rotation_distance (mm per revolution) — Voron 2.4

PrinterVoron 2.4
Stock firmwareKlipper (rotation_distance)
ExtruderClockwork 2 / Afterburner geared direct drive (self-built)
Stock default22.6789511 mm per revolution (gear_ratio: 50:10)
Worked example100 mm requested, 97 mm measured → 21.9986

A Voron 2.4 is self-built, so there is no factory default — but the official Voron config starts every builder at rotation_distance 22.6789511 for the Bondtech-style 5 mm drive gears. This default comes from the manufacturer’s own firmware or config. Source.

How to calibrate on the Voron 2.4

  1. Heat the hotend to normal print temperature and mark the filament exactly 120 mm above the extruder inlet with a ruler and a fine marker or tape flag.
  2. Extrude 100 mm slowly. From a console send G91, then G1 E100 F60 — slow, so back-pressure does not skew the measurement. If Klipper rejects the move, set max_extrude_only_distance to at least 101 under [extruder] and RESTART first.
  3. Measure what actually went through. Measure from the inlet to the mark again — actual extrusion is 120 − remainder (23 mm remaining means 97 mm extruded).
  4. Compute the new value. new rotation_distance = old × actual ÷ requested — with the stock 22.6789511 and 97 mm measured: 22.6789511 × 97 ÷ 100 = 21.9986. Note the direction: under-extrusion pushes rotation_distance down. The calculator does this arithmetic for you.
  5. Save in printer.cfg. Paste rotation_distance: 21.9986 under [extruder] (leave gear_ratio: 50:10 as it is), then RESTART. Klipper has no M500 — the config file is the save.
  6. Confirm. Repeat the test once; the mark should land 20 mm from the inlet. Within about ±0.5 mm is measurement noise, not a reason to iterate.

Notes for the Voron 2.4

The starting value assumes the Bondtech-style drive gears; the gear_ratio line changes with the toolhead (50:10 for Stealthburner/Clockwork 2, 50:17 for Afterburner with BMG gears). Because every Voron is hand-assembled, this calibration is mandatory, not optional.

Frequently asked questions

What is the stock rotation distance on the Voron 2.4?
The stock rotation_distance is 22.6789511 mm per motor revolution, paired with gear_ratio: 50:10 in the stock config. This default comes from the manufacturer’s own firmware or config. Run the mark-and-measure test once to tune it for your specific machine.

How do I change rotation distance on the Voron 2.4?
Edit rotation_distance under [extruder] in printer.cfg and send RESTART (or paste the new value and use SAVE_CONFIG if you set it via a console macro). Klipper has no M500 — the value lives in the config file.

What is the formula for the new rotation_distance?
new rotation_distance = old × actual ÷ requested. If you asked for 100 mm and measured 97 mm, the value goes down: 22.6789511 × 97 ÷ 100 = 21.9986. This is inverted versus Marlin e-steps, which go up for the same under-extrusion.

Can I use e-steps (M92) on the Voron 2.4?
No — the Voron 2.4 runs Klipper, which only understands rotation_distance. M92 has no effect. If a guide gives you e-steps, convert: rotation_distance = (full steps per rotation × microsteps) ÷ steps per mm, accounting for any gear_ratio in the config.

How often should I recalibrate extrusion on the Voron 2.4?
After any change in the drive path — extruder gears, motor, hotend or extruder assembly — and whenever every print shows consistent over- or under-extrusion across filaments. It survives filament swaps; per-filament differences belong in the slicer’s flow setting, not in rotation_distance.

Related tools