Frequent filament extrusion issue!!!

[Rabin_Dhamala 0]

Hello everyone!!!

 

Recently I have been facing issues with filament extrusion quite frequently in my ultimaker 2+. Below are some results after applying atomic method to make sure that the nozzle is not clogged and although I pull out the filament quickly, it seems that the filament is being overheated and thus melts to much larger extent than it normally should. I need to completely disassemble the hot end and reassemble again to make sure the problem is gone but every now and then the issue comes up again and again. Sometimes even while changing the material the filament gets stuck into the bowden tube and I need to pull it out manually forcefully (could be because of the increase in diameter of the filament because of heating at the hot end). Am I having any serious issue at the hot end that I need to consider? 

[Smithy 1,135]

Is your hot end fan working properly, the middle one?

And what about your PTFE/TFM coupler, is it looking good? Maybe you should try to replace it.

[Rabin_Dhamala 0]

Yeah, no any issue with the fan. And I do have a spare PTFE/TFM coupler but the old one doesn't look that bad. But ok I will give a try....

[Smithy 1,135]

Was just an idea with the couple, when it looks good, then there is no need to replace it. But keep in mind, from outside, it always looks good.

 

What about the filament, does it happen with other spools as well? Maybe you have one spool with a slightly bigger diameter?

[Rabin_Dhamala 0]

Not just from outside. Since I have opened the hot end so many times 😉. The diameter looks quite same. I just measured with a vernier caliper. And all of them are from the same brand(ICE) so may be not that issue particularly.

 

[Smithy 1,135]

hmmm, strange. But besides the issue when unloading, what are your issues during printing? Underextrusion?

What about your nozzle, is it a standard nozzle?

 

Have you change/replaced something between "it was working" and now?

[Rabin_Dhamala 0]

Basically I go with 0.4 sized nozzle but recently I have tried with 0.6 and 0.8 too and now I am again with 0.4. Yeah the filament that comes out feels rough and not as smooth as it used to be before but still the print job is okay. Here is a picture for your reference. I don't know if you can see it clearly or not.

[Smithy 1,135]

If you have another 0.4 nozzle, try to change it. Do again an atomic pull, then change the nozzle. Maybe you have a small gap between the nozzle on the hot end isolator which is causing the thicker end of the filament. 

 

Generally I am slowly out of ideas, as you know the hotend is just the block the nozzle, hot end isolator and TFM coupler, thats it. 

 

[Smithy 1,135]

And if you have another brand of filament, try it as well. We have several threads here with problems with the ICE filament. I don't want to say, it is the reason, but just to be sure it is not.