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Bruce B
(@bruce-b-2)
Active Member
Under extruding

My most recent print had significant under extrusion in the top few layers.  I assumed I had a clogged nozzle and did several cold pulls. The tip came out clean so I tried another print. Still significant under extrusion and I can hear the extruder stepper clicking and see that it is not feeding filament consistently. I triple checked the extruder tensioner with no improvement and finally disassembled the extruder and visually checked the entire filament path - its clean and clear. Is the stepper motor bad? How would I check?

Prusa MK3S. Firmware 3.9.2. MMU2S is installed but printing in single mode so not applicable I think. 

Posted : 12/12/2020 3:23 pm
Peter M
(@peter-m)
Noble Member
RE: Under extruding

Try different filament.

Do a nozzle change.

Try higher temperature nozzle.

let us see a picture of failed print, and a first layer picture.

What filament are you using? Change some settings? How more info you give , the better the help will be.

Posted : 12/12/2020 6:00 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Under extruding
Posted by: @bruce-b-2

My most recent print had significant under extrusion in the top few layers.  I assumed I had a clogged nozzle and did several cold pulls. The tip came out clean so I tried another print. Still significant under extrusion and I can hear the extruder stepper clicking and see that it is not feeding filament consistently. I triple checked the extruder tensioner with no improvement and finally disassembled the extruder and visually checked the entire filament path - its clean and clear. Is the stepper motor bad? How would I check?

Prusa MK3S. Firmware 3.9.2. MMU2S is installed but printing in single mode so not applicable I think. 

If the E-stepper motor gets too warm and you print PLA, the filament may become soft and will not extrude consistently anymore.

To keep the stepper cooler, you could add a 40x40mm fan.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 12/12/2020 6:36 pm
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