Mid print underextrusion issues

The next article will guide you on how to solve mid print underextrusion issues.

We can easily detect an underextrusion issues when the printed model has a lack of material or when simply there is no filament coming out of the hotend. This happens because the printer is not able to supply material correctly, and there are several parts on the printer that can be related to this issue. We’ll look into these in the following article.

Benchy underextrusion

If underextrusion is happening during the first layer, check the following article:

Article: Underextrusion issues (first layers)

If underextrusion is happening mid print,  make sure that filament is actually coming out of the nozzle. To do so, stop the print job, go to the Filament/Purge menu, preheat the hotend and check if filament is coming out.

 

filament-purge-bcn3d


If filament is not coming out follow this steps:

Error list information

Make sure that there is no temperature related error affecting the hotends. If there’s any of the messages showing up on the LCD, follow the steps explained on this article:

Article: Error messages

 

Preheat test

If there’s no error message on the LCD, Preheat the hotend to confirm that it reaches the target temperature and that once it does, the temperature does not oscillate.

 

hotend-preheat-bcn3d

If the temperature is reached correctly, follow these steps.

 

Unload filament

Go to Utilities/Filament/Unload, select the clogged extruder and unload the filament. 

If filament is not unloaded automatically, follow the steps explained on this Article:

Article:  How to manually unload the filament

Once the filament has been unloaded follow these steps to troubleshoot for possible causes.

 

Clean the hotend 

To clean the hotend follow the steps explained on this article:

Article: How to clean the hotend 

 

Check the operation of the cooler fan

To check if the cooler fan is working, follow the steps explained on this article:

Article: How to check the operation of the cooler fan

If the cooler fan is not moving, the problem could be coming from the extruder board. To rule that option out, check if the fan on the other printing head is working. If it is, there are two things you can try

 

Check the operation of the HEPA filtre fan

If you are printing with low temperature fusion materials, like PLA, it's possible that the chamber is overheating, and that could cause underextrusion issues. To rule this out, make sure that the HEPA filtre fan is working correctly, and air is being blown out of the printer, by placing a paper on the fan output.

bcn3d-epsilon-hepa-filter

 

Check the operation of the Bondtech extruders

To check the operation of the Bondtech extruders follow the steps explained on this article:

Article: How to check the operation of the Bondtech extruders

If the gears on the bondtech are moving correctly, make sure that the extruder is clean, following the steps explained on these article:

Article: How to clean the Bondtech extruders

If the bondtech extruder is not moving, Check the flat cable connections to the E driver, as well as the cable connection between the E motor and driver.

epsilon-extruder-driver-cable

Article: Check the flat cable connection

If everything is connected correctly and the E motor does not move, the problem could be coming from the driver. If the other extruder motor is working correctly, try swaping the E drivers from one motor to the other, as explained in this article::

Article: How to change the Bondtech driver

 

STL Model and configuration

The model you are printing and the material/configuration that you are using could also have an effect on the print and be the root cause for underextrusion issues, specially if you are printing with advanced materials or using an experimental configuration.

In this section you can find articles covering tips and tricks for model positioning, material configuration etc.

Article: Cura - Tips for model positioning.

If you can't find the information you are looking for here, feel free to contact us at through our ticket system and let us know about your project so we can help you out.

 

Filament

The conservation of the material is also a really important point to have in mind. Make sure that you are doing it right by checking this article:

Article: How to store your filaments

 

Change hotend

If none of this options solves the problem and you still have underextrusion issues, it’s possible that the hotend is clogged. To change the hotend, follow the steps explained on this article.

Article: How to change the hotend

 

Forum Community

Need more tips? Check out our forum community for more info about this

 

It's important to keep your printer in good shape to make the most out of it. In this chart you can find a list of the extruder maintenance procedures and how frequently these should be done. Maintenance Plan

 

bcn3d-recycle  Take your e-waste to a certified recycler. Check how we do it in BCN3D.

 


RELATED ARTICLES

print quality issues EN

 

create material profiles EN

 

 

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