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JSF
 JSF
(@jsf)
New Member
Advice required

Have just had a serious misprint and wondering how to rectify this

printing with Prusa PLA. The bottom of the print head assembly is now encased by solid filament that has bonded too or distorted some of the 3D print components of the print head assembly. The mass of filament has also covered several of the cables

any suggestions as to how to remove this would be gratefully received

regards

JSF

Napsal : 31/03/2023 6:30 pm
Hello
(@hello)
Noble Member
RE: Advice required

Search blob of doom you may need to heat from outside then carefully pull of being very careful with wires 

Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models

Napsal : 31/03/2023 7:21 pm
Diem
 Diem
(@diem)
Illustrious Member

You have a blob-of-doom.

If you are using firmware 3.12 or later then the following may not work but if you have not upgraded this year it should be OK.

Search for blob of doom to see how others have dealt with them.

Before doing anything, look at pictures of a clean extruder and note the position of the rather delicate wires that are currently hidden, if you damage them you will have to buy replacement parts as broken wires can't be rejoined.

You have probably damaged your fan shroud and will need a replacement.

To remove it:

Raise the nozzle temperature to the printing temperature for the filament in question and allow it to heat for several minutes.

If you are lucky you will be able to prise the blob open - more likely you will need to add heat from outside with a heat gun to aid the softening, sometimes it's worth using a soldering iron to carve chunks off the mass.

Use needle nosed pliers to prise this away; remove it in parts if it won't release the wires.

Once you have the worst removed you decide whether you need to disassemble the extruder to get at all the blob or perhaps you can clean up in situ.

After the cleanup there will be overcooked filament inside the nozzle so at least a purge and probably a cold-pull will be necessary.

* * *

The latest firmware is supposed to reduce the chance of these blobs growing out of hand but as a side effect they make cleaning up more difficult.  So if you have upgraded and your attempts result in a thermal anomaly then come back, there are a couple of things we might try.

Cheerio,

Napsal : 31/03/2023 7:31 pm
Hello
(@hello)
Noble Member
RE: Advice required

Oh yes course forgot about thermal anomaly 

Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models

Napsal : 31/03/2023 7:36 pm
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