Whenever I run out of filament - I have to disassemble the entire extruder
 

Whenever I run out of filament - I have to disassemble the entire extruder  

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Mattias Fagerlund
(@mattias-fagerlund)
Active Member

Every time the filament runs out, the extraction fails and the filament gets stuck inside the extruder. The only way I've found to dislodge it is to disassemble the extruder (which takes a VERY long time). Is this to be expected? The run-out sensor doesn't do be doing anything.

Oh, and it's totally impossible to continue the print after the extruder has been moved around, so the print fails.

Do you all throw away spools as they start running out, or am I doing something wrong?

Posted : 26/01/2020 2:28 pm
RH_Dreambox
(@rh_dreambox)
Prominent Member

Is the filament sensor active?
Look in the "Settings / Filament sensor On" menu.

Bear MK3 with Bondtech extruder...
Posted : 26/01/2020 4:28 pm
bobstro
(@bobstro)
Illustrious Member

Try extruding a bit of filament before ejecting if you can. That will soften the tip and reduce the possibility of a blob getting stuck higher up during removal.

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 : 26/01/2020 4:48 pm
Mike Daneman
(@mike-daneman)
Estimable Member

You have to trim off the bent piece of filament for the end before it goes into the extruder. Otherwise it’ll get stuck. 

Posted : 27/01/2020 8:18 am
Nikolai
(@nikolai)
Noble Member
Posted by: @mattias-fagerlund

Oh, and it's totally impossible to continue the print after the extruder has been moved around, so the print fails.

Do you all throw away spools as they start running out, or am I doing something wrong?

It happened to me once because of the bend filament end. I was able to open the door, remove the filament and assemble everything back without moving the head. It continued to print like usual. No failed print.

Often linked posts:
Going small with MMU2
Real Multi Material
My prints on Instagram...
Posted : 28/01/2020 12:06 am
Mattias Fagerlund
(@mattias-fagerlund)
Active Member

@rhdreambox

Yep - it did notice that it had run out - but it fed it far enough that it couldn't be caught!

Posted : 03/02/2020 5:16 pm
Mattias Fagerlund
(@mattias-fagerlund)
Active Member

@nikolai-r

Thanks to all who replied, it sounds like it should be possible to save the situation without resorting to disassembling the extruder. I'll try harder next time - but I would prefer if the prusa stopped extruding waaaay earlier than it seems to have done so far.

Posted : 03/02/2020 5:33 pm
rmm200
(@rmm200)
Noble Member

If I had your problem often - I would look at one of the extruder variants that make this easier.

Bear BNBSX or Skelly. I have the parts for the BNBSX - still on my to-do list.

Posted : 03/02/2020 5:45 pm
Nikolai
(@nikolai)
Noble Member

@mattias-fagerlund

I would prefer with as-well but it's physically not possible. The filament end need to pass the sensor before it triggers. And if the filament end is angled badly because this is how it gets on the roll then there is not much you can do at the sensor.

Often linked posts:
Going small with MMU2
Real Multi Material
My prints on Instagram...
Posted : 03/02/2020 5:45 pm
Martijn Janssen
(@martijn-janssen)
New Member

This is a known issue, according to Github. 

https://github.com/prusa3d/Original-Prusa-i3/issues/135

No solution yet, as far as I know. 

Posted : 28/03/2021 9:50 pm
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