Printer chewed up filament at the bowden gears again.
 

Printer chewed up filament at the bowden gears again.  

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doug.c5
(@doug-c5)
Active Member

My print stopped mid-way, and when I checked on it, I found that the filament was chewed up and wedged around the bowden gears, as in the picture below.

This is now the second time that this has happened. The first time, I was using wood-infused PLA, and it is a bit brittle, so I chalked it up to that. This time, however, I was using Prusa Azure Blue PLA, so I'm wondering if there is something wrong with my setup that leads to it doing this.

It was quite warm when it happened this time--40/101F (I don't remember how hot it was the first time)--and I see things about thermal creep, so I'm wondering if this is that. There were no errors shown on the display or anywhere that I could find. 

I'd appreciate any thoughts on the matter!

Now I'm off to disassemble the printer, as I cannot readily get the filament out of either end.

 

Posted : 06/09/2020 8:35 pm
gwade-home
(@gwade-home)
Active Member

I had something similar happen with my first use of Flex 98A and I adjusted the bowden gear so that it just caught the filament and the problem went away, I have not had to adjust for any other materials that I have used, don't know if this your problem, just providing some input.

 

 

Posted : 06/09/2020 10:04 pm
doug.c5 liked
Karl Herbert
(@karl-herbert)
Famed Member
Posted by: @doug-c5

My print stopped mid-way, and when I checked on it, I found that the filament was chewed up and wedged around the bowden gears, as in the picture below.

This is now the second time that this has happened. The first time, I was using wood-infused PLA, and it is a bit brittle, so I chalked it up to that. This time, however, I was using Prusa Azure Blue PLA, so I'm wondering if there is something wrong with my setup that leads to it doing this.

It was quite warm when it happened this time--40/101F (I don't remember how hot it was the first time)--and I see things about thermal creep, so I'm wondering if this is that. There were no errors shown on the display or anywhere that I could find. 

I'd appreciate any thoughts on the matter!

Now I'm off to disassemble the printer, as I cannot readily get the filament out of either end.

 

 

Before you disassemble the hotend, I would try to heat it up to 280 degrees C., remove the nozzle and try to remove the stuck filament with a 1.5mm wire or similar ( https://www.amazon.de/gp/product/B07R6Y2LKS/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1 ).
When printing PLA you should make sure that the ambient temperature is not above 35 degrees C. and that the extruder motor does not get too warm - if necessary, actively cool it down.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 06/09/2020 10:30 pm
doug.c5
(@doug-c5)
Active Member

This is the filament that was above the gears:

This is the filament that I recovered from the PTFE tube after I pulled it out of the top of the hot end. It appears that it got stuck and then the feed from above bent it, but since I poked at it with a needle, etc, that's not 100% certain.

The filament was capped at the top of the PTFE tube: Filament filled the cup. So this shows where the bottom of the filament was with respect to the tube, or at least pretty close.

Posted : 07/09/2020 12:04 am
doug.c5
(@doug-c5)
Active Member

@karl-herbert

Thanks!

I heated it up, but it didn't come out, so I had to disassemble and pull the PTFE and filament out the top

Posted : 07/09/2020 12:05 am
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