K2 extrusion stops after a few minutes (tried everything, still happening)

Flagship K Series
1

Hi everyone,

I’m having a very frustrating issue with my Creality K2 and I can’t figure out what’s causing it.

I have already tried multiple things:

  • Cleaned/unclogged the nozzle several times

  • Inspected the nozzle, extruder, and CFS system

  • Dried my filament

  • Tried brand new filament (freshly opened)

  • Tried printing both from CFS and from the external spool holder

The behavior is always the same:

The printer starts normally, filament flows smoothly, and printing begins without any issues. But after a few minutes, extrusion suddenly stops.

After that, I clean the nozzle again, it works for a short time, and then the problem repeats. This has happened multiple times in a row.

The fan is working and airflow seems fine.

At this point I’m not sure if the issue is heat creep, extruder motor, feeding system, or something else.

Has anyone experienced something similar or has any idea what could be causing this?

Any help or suggestions would mean a lot.

Thanks!

2

What do you hear/see when the extrusion stops? Clicking sound?

When resolving the issue what do you need to do get extrusion running again?

3

“I can’t hear anything—it’s probably the extruder clicking since it’s turning but the filament isn’t coming out, but the fans are drowning out the noise. When it jams, I unclog it and manually extrude; the filament flows perfectly fine. But then, after about 20 minutes of printing, it stops again.”

4

Hi

This sounds like an issue with heatcreep. have you changed the nozzle at any time?

You state the fan is working, are both the part cooling fan and the hotend fan working?

Try removing the nozzle assembly and check that there is Boron Nitride Paste applied by the heatbreak.

You could try lowering the print temps slightly to see if this helps.

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5

@MOBITECH If you need to buy new thermal paste, @JoeFriday turned me on to GD900. GD900 is great! I’ve been using thermal paste for various applications for decades, and I’ve got to say this is the best thermal paste for 3d Print temperatures that I’ve ever seen. Amazon.com: Net Weight 30 Grams Syringe with Bag Packaging Gray GD900 Thermal Conductive Grease Paste Silicone Compound Heat Sink Cooler BX30 (GD900-BX30*1 Piece) : Electronics If you don’t have any thermal paste laying around that suits 3d Temperatures (most CPU paste dries out at the higher 3d temperatures), then Joe & I can recommend this one.

6

“Thanks everyone for the replies. The thing is, the printer was bought recently and only has about 110 hours of print time. I’ll see if the thermal paste trick solves the problem.”

7

Thank you all for the suggestions. Applying the thermal paste appears to have resolved the issue, and it’s working perfectly so far. Thanks again for your help.

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8

That is awesome to hear what a community we have here

1 Like