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Core 1: severe underextrusion?  

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verthh
(@verthh)
Member
Core 1: severe underextrusion?

Moin!

Over the last days I upgraded my MK4S to a Core 1 and added the camera, filtration and MMU3.

The printer produced one normal looking nice first layer, than it stopped extruding correctly. During printing there are clanging noises which - I believe- come from the extruder.

 

No failure messages at all, all calibrations passed, MMU3 seems to do its thing.

 

What should I do next? I pushed the hotend up as far as I could, I did several recalibrations of the extruder gears, I tightened the extruder idler screws a little bit...

 

This is the wrecked beginning of a benchy:

 

Beginning of print:

Napsal : 26/09/2025 1:39 pm
hyiger
(@hyiger)
Reputable Member
RE: Core 1: severe underextrusion?

It's possible the idler tension screws are too loose. Try tightening both 1/8 of turn each. Sounds like the filament is slipping on the extruder gear. 

Napsal : 26/09/2025 2:47 pm
chmax
(@chmax)
Estimable Member
RE: Core 1: severe underextrusion?

yeah, the standard setup for the extruder screws used for the mk4 series still apply! I recommend checking the full build instructions and check if you can spot any major differences in the way the extruder is setup...

Napsal : 26/09/2025 3:16 pm
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