Total melt down on the head, is it repairable?  

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UAL - CCI
(@ual-cci)
New Member

Hi there, 

One of the prusas MK3s head's has fused to extruding plastic and melted...!

 

Looks to me like I might need take apart, again, (we ordered the assembled but got sent the kit which took me 3 days to build) then to rebuild and replace the entire thing. 

Is there a pack I can buy of just all the parts for the print head? 

Many thanks.

Posted : 18/02/2021 12:12 pm
bobstro
(@bobstro)
Illustrious Member

If you're in the US, Filastruder, Printedsolid and MatterHackers carry Prusa versions of the E3D hotend parts. You can get a full assembled hotend. Be sure to get the Prusa versions except maybe the heatbreak. 

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 18/02/2021 2:48 pm
cwbullet
(@cwbullet)
Illustrious Member

I would heat the hotend or use a heatgun to soften and carefull remove the plastic with tweezers.  

This post was modified 2 months ago by cwbullet
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Chuck H
3D Printer Review Blog...
Posted : 18/02/2021 3:02 pm
Xanthe
(@xanthe)
Active Member

If the mounting point for the part cooling fan duct is intact, you may only need a replacement fan duct.

In any case it's a good precaution to get a spare heater cartridge and thermistor, and also print off a set of parts to rebuild your hot end... just in case another 'blob of death' savages your hot end in the future (than all you need to do is salvage the metal parts and reassemble it!).

Posted : 18/02/2021 4:06 pm
Dan Rogers
(@dan-rogers)
Reputable Member

if you are careful, you will only need the fan shroud.  Raise the head to about 100 position or so so you can see and get in there with needle noses and picks.  Be careful around the nozzle wires where they go into the heat block.  It doesn't look too bad from the pictures.

What were you printing with at the time?  PLA?  PETG?  For either of those, when that happened to me, I set the printer to pre-heat at PETG temps.  As that heats up, the blob will start to soften - and parts of it will start to sag towards the bed.    The fan shroud is a "wear part" - you expect to break those now and again - so get yourself a couple of those for spare.  

As the blob melts - start picking off the areas that are soft and dripping. Warning its going to be too hot to touch with your fingers - recommend some gloves for some protection since it is so easy to forget and reach for that one piece ... 

Keep picking till you can see the nozzle come into view.  Take some pictures as it gets that far.  If the cycle goes too long it will auto-cool down.  Let it cool down and repeat the process.  I had a working printer from the blob of death about an hour later - but I did have a spare fan shroud since I bought one way early on because it is such a fragile part and very hard to print at home.

 

Posted : 18/02/2021 4:21 pm
cwbullet
(@cwbullet)
Illustrious Member

@dan-rogers

I have to agree - it is not bad based on the photo.  I think it is salvagable with care.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 18/02/2021 5:07 pm
Ray Fox
(@ray-fox)
Active Member

@bobstro

Sometimes you can find Prusa compatible on Amazon. Usually cheaper, free delivery, and faster. Plus if it doesn't work, it is returnable.

Posted : 28/02/2021 12:14 am
Clarmrrsn
(@clarmrrsn)
Reputable Member

@cwbullet and Dan Rogers 

Agreed, I had a similar issue on the ender 3, was wrapped around the thermistor and heater wires and all around the nozzle, was a solid block of plastic,  Almost freaked when I saw it.

Heated the nozzle to 210 and very carefully worked around removing it a bit at a time., sometimes pausing to let bits melt.

Don't try and remove it too early, give it a chance to melt a bit of it and will be surprised how easy it starts to come away 

 

Tank you very much!...
Posted : 28/02/2021 12:30 am
UAL - CCI liked
cwbullet
(@cwbullet)
Illustrious Member

@clarmrrsn

Patience truely is a virtue.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 28/02/2021 12:53 am
Clarmrrsn
(@clarmrrsn)
Reputable Member

@cwbullet

Except when waiting for a MK3 😉

Tank you very much!...
Posted : 28/02/2021 12:55 am
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