What is Extruder Calibration
Extruder calibration is checking how much filament the printer actually feeds when told to feed, for example, 100 mm.
3D Printer Extruder Calibration — Simple and Correct Method
Compute a new E-steps (Marlin) or rotation_distance (Klipper) value from the 100 mm test. Below the calculator — how to run the measurement and why it matters.
Extruder Calibration Calculator
Follow the steps below for accurate extruder calibration. The calculator will show the new value automatically.
1
Select firmware
Klipper
2
Enter current value
Current value from firmware (E-steps or rotation_distance)
3
Take measurements
4
Get result
New value:21.154mm/rev
Difference:-0.846
Commands to apply
In printer.cfg change the parameter:
rotation_distance: 21.154
Then execute RESTART
Why do this at all
If the extruder is calibrated incorrectly, problems appear:
- thin or torn walls
- plastic blobs
- unstable printing
- Flow settings don't give normal results
Extruder calibration is the foundation, without which further tuning is almost useless.
Important point about nozzle and material
Many instructions suggest running filament through a hot nozzle. This works, but gives inaccuracy.
- different plastics melt differently
- nozzle creates resistance
- possible slippage and clogging
Therefore, the most accurate and recommended method is to calibrate the extruder without the nozzle to check only the feed mechanics. Flow is tuned later and separately.
What you'll need
- ruler or caliper
- marker
- access to extruder control (Marlin or Klipper)
No need to heat the hotend if filament comes out freely.
Step-by-step instructions
Step 1. Prepare the printer
- Remove the nozzle or disconnect the Bowden tube from the hotend
- Main thing: filament should come out freely, without resistance
Step 2. Find the current extruder value
- Marlin: parameter E-steps (steps/mm)
Can be found in printer menu: Configuration → Steps/mm → E-steps, or send M503 command to terminal - Klipper: parameter rotation_distance
Located in printer.cfg file in [extruder] section
If you haven't changed it before — use the current value.
Step 3. Mark the filament
- measure 100 mm from the extruder output
- put a clear mark with the marker
Step 4. Feed the filament
- give the extruder command to feed exactly 100 mm
- use slow speed
- wait for the command to complete
Step 5. Measure the result
See where the mark ended up: if the mark is exactly at the output — everything is perfect; if 10 mm remains — 90 mm was fed; if the mark went inside — more than 100 mm was fed. Record the actual feed length.
FlashForge Adventurer 5M
- In stock firmware, extruder access is limited
- If Klipper Screen or custom firmware is installed — calibration is done the same as for regular Klipper
If access is blocked — extruder cannot be calibrated, only Flow is used.
What to do next
Summary
- Extruder is calibrated by mechanics, without nozzle
- Material and temperature don't matter here
- Flow is a separate setting, not a replacement for extruder calibration
- Once done calibration works long and stable
If the printer feeds filament accurately — printing becomes noticeably better.
FAQ
What E-steps or rotation_distance value is normal?
There's no universal value — it depends on the stepper, microstepping and extruder gearing. Direct-drive Marlin E-steps are often around 90–500 steps/mm, while Klipper rotation_distance is a few millimeters. The right value is whatever your own 100 mm test produces.
Should I calibrate hot or cold?
Always hot — heat the nozzle to the filament's print temperature. A cold hotend can't melt filament, so the test gives meaningless results or strips the filament.
Marlin vs Klipper — what's the difference?
Same goal, different parameter and formula. Marlin tunes E-steps (steps/mm) via M92 and M500; new = old × requested / actual. Klipper edits rotation_distance in printer.cfg; new = old × actual / requested — the formula goes the opposite way.
How often should I recalibrate? Do I need to when changing filament?
E-steps and rotation_distance are a mechanical baseline that doesn't depend on filament. Calibrate once and only re-check after swapping the extruder or its gears. Material differences are handled by slicer flow rate, not by this calibration.
Why extrude slowly?
At high speed the melt zone builds back-pressure and the drive gear can slip — both skew the measurement. So extrude at 100 mm/min (G1 E100 F100) and avoid the touchscreen extrude button, which runs fast.
It extruded noticeably less than 100 mm — what now?
A small shortfall just means tweak E-steps or rotation_distance. But a large shortfall points to mechanics first: a clog or partial jam, weak idler tension, a worn drive gear, or too-low temperature. While the extruder clicks or slips, any math is meaningless.
