Issues printing with PETG

Flagship K Series Creality Flagship K1 Max
1

Hello, I’m writing to you about an issue I’ve got with my K1 Max printing using filament Jayo PETG, with original extruder.

Filament Issue-2026-03-07_02
Filament Issue-2026-03-07_021047×1450 215 KB

After printing for may be half an hour, the filament get stucked inside the extruder (as you can see in picture attached) and of course it doesn’t come out.

So, i understood it is a temperature issue.

For printing I used the default Creality Print profile for Generic PETG,
with 250 degrees for nozzle, machine top cover on, front door closed.
Should fans all on? Should the top cover off as for the PLA?
Should I change speed?

Or is it an extruder issue?

Also, is there is a solution about filament out sensor that doesn’t work at all?

Thanks in advance for your replies.

2

I think 250 is too much, I go with 235 and no issues, fan slow speed, covers on.

3

What is the speed you are printing at? For generic PETG I would not exceed 100mm/s and nozzle temperature of 235c and bed at 70 c.. For hyper PETG I set mozzle at 250c and print at 250 mm/s and have not issues with either my K1c or K2.

Bill

4

Thank you Bill ! I will try to print with these parameters.