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PLA blob holding extruder assembly stuck together  

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3DCoded
(@3dcoded)
Eminent Member
PLA blob holding extruder assembly stuck together

Last night, I started a print, and neglected to watch the first few layers. This morning, I woke up to this disaster:

I've cleared many, MANY blobs in the past, but this one is the only one I'm come across that's crept up into the extruder assembly. The steps I usually take to removing a blob:

  1. Heat the hotend to 30ºC + printing temp
  2. Disassemble the extruder assembly to gain access to the hotend (Didn't work because extruder assembly is stuck together by the blob)
  3. Pull the blob off
  4. Replace heater/thermistor if necessary
  5. Reassemble everything

In this case I can't even get past step 2.

Extra information:

  • I have a mosquito hotend (most expensive part of the print head, so I want to salvage that)
  • I don't have a heat gun
  • I have a CHT 0.6mm nozzle (I'd also like to salvage at least that)
  • Everything else except the PINDA probe (extruder motor, Noctua fan, print fan) I have replacements for

 

Help is greatly appreciated. Also, if you have a better set of steps to clearing a blob, please let me know.

This topic was modified 4 weeks ago by 3DCoded
Posted : 22/06/2024 10:34 am
Diem
 Diem
(@diem)
Illustrious Member

Begin by carving away the worst with a soldering iron - then review.

Cheerio,

Posted : 22/06/2024 1:59 pm
3DCoded
(@3dcoded)
Eminent Member
Topic starter answered:
RE: PLA blob holding extruder assembly stuck together

Thank you for the quick reply. I'm hesitant to pull out the soldering iron because I don't want to melt the extruder parts, but I think heat is the only option at this point. I can try that and post my results back here.

Posted : 22/06/2024 2:05 pm
Eef
 Eef
(@eef)
Reputable Member
RE: PLA blob holding extruder assembly stuck together

As @Diem said: Heat (with a soldering iron) could surely help. And I understand your hesitation about damaging stuff. 
So maybe this may help: 
- Find your self a, small, kettle or cooking pot (how you call such things in english :-)).
- Fill it with hot water, cook it 
- Heat the heatbed uptill about 100 degrees. 
- place the hot water below the extruder; lower it just above the water (not IN, you do not want electrical issues.  
- you could even heat the nozzle up to about 100 degrees. 
All this heat, will, (and it will take time) melt the PLA, so it drops down . 
- hang a plastic bag around, so the heat is kept close to the extruder. 
NB: Water is the best for this, because it can hold a lot of thermal energy, before cooling down. 

We will do what we have always done. We will find hope in the impossible.

Posted : 22/06/2024 6:04 pm
3DCoded
(@3dcoded)
Eminent Member
Topic starter answered:
RE: PLA blob holding extruder assembly stuck together

Thank you for your help. I was able to successfully clear the blob by:

  1. Removing the bolts holding the extruder together
  2. Using a flathead to pull apart the print head, piece by piece
  3. Using a soldering iron + hair dryer to melt away the hotend from the blob
  4. Using some brute force helped with step 3. I'm really glad this was a Mosquito hotend because it's a lot more resilient to brute force.

@eef Thank you for your reply. I didn't see it until now, but this will be helpful to anyone who reads this, or if I get a blob again. 

 

I am currently in the process of reassembling with a new heater and thermistor and can post back when I'm done.

Posted : 22/06/2024 10:01 pm
3DCoded
(@3dcoded)
Eminent Member
Topic starter answered:
RE: PLA blob holding extruder assembly stuck together

Final Update:

I replaced the thermistor and heater cartridge, and reprinted the broken parts:

  • Fan shroud
  • Fan holder
  • Front of extruder assembly

Thank you again to everyone who helped me! I'm back to printing!

Posted : 26/06/2024 5:15 pm
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