How To Deal With Under Extrusion of 3D Printers?

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When printing the model, you may notice that there are gaps between adjacent layers on it, which is called under extrusion.

Although it seems that it can be set in the software to determine how much filaments are extruded, the 3D printer does not feedback the actual situation. Therefore, there may be a case where the actual extrusion is less than expected by the software.

To test whether the printer extrudes enough, you can print a 20mm cube and set to print at least 3 sidelines. After printing, check if the sidelines at the top are tightly bonded together. If there are gaps between them, it indicates that you have insufficient extrusion.

It maybe caused by the machine itself or the settings on your software. For these two situations, we have different solutions as shown below:

 

The problem 0f machine itself

It may be caused by nozzle blockage or extrusion difficulty of the extruder.

If you find nozzle blockage and you need to clean it, you can follow the steps on this article. If the extruder makes a “click” sound, which means that your extruder fail to extrude normally. This may be the results from filament blockage caused by gear slip or incorrect pulse. You can test by extruding about 10mm filaments to check whether the pulse is right.

 

The settings in the software (Cura).

To reset in the software, the process is also divided into two steps:

  1. The diameter of the filament

The first thing you need to confirm is whether the diameter of the filament you use is appropriate. Click “Basic” and you will see the “Diameter” setting option under “Filament”. Confirm that the value set is consistent with the diameter you purchased. The diameters of most filaments are marked on their package. The most common diameters are 1.75 and 3.0.

  1. The extrusion speed

If the diameter of your filament is consistent, you need to adjust the extrusion speed next. There is a very useful setting in the printer control panel, allowing you to easily modify the extrusion volume (also known as extrusion speed) of the extruder. Try to increase the extrusion speed, and then print a cube to see if there is still gap on the sidelines.

The specific steps are as follows: first enter the menu, choose “Configuration”, then “Motion”, and find “Esteps/mm” to adjust the extrusion speed. The default value is 95mm/s. you can modify it to 97mm/s, which means that 2mm more plastic will be extruded per second than before.

Note: Adjust slightly the extrusion speed each time. And the increase should not be too large to avoid excessive extrusion.

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