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Not extruding during print  

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Paul42
(@paul42)
Active Member
Not extruding during print

Prusa Core 1 L

It extrudes filament just fine when loading filament.

However, when it starts to print, nothing comes out.

And there is what sounds like a metallic rattling sound from the extruder when it retracts the filament.

New nozzle, Prusament PLA

This topic was modified 1 day ago by Paul42
Posted : 13/03/2026 3:40 pm
hyiger
(@hyiger)
Famed Member
RE: Not extruding during print

Probably a nozzle clog. Which nozzle are you using? 

Posted : 13/03/2026 4:03 pm
Paul42
(@paul42)
Active Member
Topic starter answered:
RE:

Brand new .4 HF nozzle

Extrudes fine when I load filament

 

This post was modified 24 hours ago by Paul42
Posted : 13/03/2026 6:53 pm
hyiger
(@hyiger)
Famed Member
RE: Not extruding during print

It could be heat creep. PLA can get soft, then is gets squished by the extruder gear into an oval shape and then it no longer fits in the nozzle heatbreak tube. Check the position of idler tension screws on the idle latch: https://help.prusa3d.com/article/idler-screw-tension_177367

Have you had any successful prints yet? 

Posted : 13/03/2026 7:01 pm
Paul42
(@paul42)
Active Member
Topic starter answered:
RE:

printing well for months.  

I've swapped out the nozzle and the filament.  

Prints have been a mixture of PLA and PETG.

This post was modified 21 hours ago by Paul42
Posted : 13/03/2026 9:25 pm
hyiger
(@hyiger)
Famed Member
RE: Not extruding during print

 

Posted by: @paul42

printing well for months.  

I've swapped out the nozzle and the filament.  

Prints have been a mixture of PLA and PETG.

Run the fan tests and perhaps remove the heatsink fan and use some canned air to blow out any debris. I this point I would (if it were me) disassemble the Nextruder and look for debris or broken parts, strip the grease from the planetary gears and relube. If not comfortable with that then contact support over chat. They can walk you through dianosing the issue. 

Posted : 13/03/2026 9:29 pm
Paul42
(@paul42)
Active Member
Topic starter answered:
RE: Not extruding during print

Swapped out the HF nozzle for regular brass.  Attempting again.

 

Posted : 13/03/2026 9:37 pm
Paul42
(@paul42)
Active Member
Topic starter answered:
RE: Not extruding during print

The regular brass nozzle seems to be working just fine.

Posted : 14/03/2026 1:08 pm
hyiger
(@hyiger)
Famed Member
RE: Not extruding during print

This is the reason I don't use HF nozzles anymore. They are too easy to clog and are not worth the speed benefit. 

Posted : 14/03/2026 4:07 pm
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