Random clog during print  

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Warnings
(@warnings)
Active Member

Hello,

I solve almost all my clog issue but one seem stay at random time interval with PETG. Prusa MK2S
I remove the filament cut about 2cm because there is a filament enlargement at ~1.5cm on about 5mm like the filament have melted too much at this place. Bad thermal paste or bad airflow design of the small side fan and need a new part for increase/redirect airflow ?
May be extruder force too much and cause this issue without error I read than Prusa hotend haven't the same diameter and it's reduced before the heater part ? (If extruder push and diameter is reduced can explain the clog so high when I remove the filament no ?)

The fan run and when I remove these 2cm load again and run for hours without issue until next random clog again. Just can't let the printer run during night and when I leave.

Thank you if you have a trick not seem the filament, temperature, extruder speed this time 🙂

Posted : 05/03/2021 9:43 pm
cwbullet
(@cwbullet)
Illustrious Member

For me, this is filament-dependent.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 06/03/2021 1:40 am
Warnings
(@warnings)
Active Member

@cwbullet Thank you I can try with another brand PETG spool.

1.75mm not respected ?

Posted : 06/03/2021 9:46 am
Warnings
(@warnings)
Active Member

That's the filament after unload cut on the left :

PLA print at 240° (try to clean) but have extruder noise like something block inside never have any issue with this spool before and you can look the result. I try to increase temperature to 260° (same issue at 250) for not have anymore this noise and try to clean hotend if I have some part of PETG inside.

Posted : 07/03/2021 10:40 am
cwbullet
(@cwbullet)
Illustrious Member

You might have an issue with the heartbreak.  That widening might be causing the clog if there are restrictions during the print.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 07/03/2021 2:42 pm
Warnings
(@warnings)
Active Member

What can happen with this part ? It's just a hole with two threads.
Old thermal paste who not transmit correctly cold from the fan ?
Or MK2S have the same issue than MK3S where the heatbreak have a reduced diameter compared to the original ?

PTEG should be fully cleaned now with so many PLA printed.
PLA temperature for not have issue with extruder seem way too high but when I try to decrease have at each time issue. Print PLA between 195/205 before try to print PETG with this spool.

When I load filament seem flow correctly when I try to print have directly extruder issue. Need to reduce retraction during print ? (read that somewhere may be reduce issue ?)

Posted : 07/03/2021 5:46 pm
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