Underextrusion & Extruder calibration

Updated 1 month ago ​by Tomáš Chvalina

If there is not enough material in your print, you can see gaps in places, where full shell should be instead. In 3D printing we call this phenomena underextrusion and not enough material is flowing through the nozzle.

Major underextrusion

  1. Make sure that you are using proper settings for proper material. As well as if there is only slight underextrusion. It shall be tweaked with minor temperature change. Recommended temperatures are usually to be found on the spool.
  2. Check that you do not have your Extruder driver gear (Pulley) full of filament dust. Also seek for the upper part of the extruder, where you need to have sufficient pressure by tightening screws.
  3. Many failed prints can be result of clogged nozzle, because not enough material is flowing through. You can check more information about clearing nozzle in Clogged nozzle.

Marginal underextrusion (Extruder calibration)

If you still experience marginal underextrusion after clearing your nozzle and checking your pulley. You can consider doing so called "Extruder calibration". 

Do not do so, unless you are 100% sure that mechanically there is everything in order.

Extruder calibration "calibrates" loading proper amount of filament into your extruder. So that once your printer thinks it is extruding 100mm filament. It is really extruding such amount. Nothing more, nothing less.

How to do Extruder calibration 

  1. You must connect your printer to the Pronterface via. the usb cable. More about that in Pronterface and USB cable.
  2. Measure 110mm of filament from the entry into the extruder. Mark the 110mm distance with marker.
  3. Extruder 100mm with in Pronterface with command: 



Do not hesitate to contact us at info@prusa3d.com if you would have any following questions.



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