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Filament stuck during print  

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thomas.k25
(@thomas-k25)
Active Member
Filament stuck during print

Hi,

i have a prusa mk3s and i print since a year. after i changed the heatblock i have the following problem:

the printer works fine for the first couples of prints after changing the printhead. a couple of days later, the printer starts to fail to transport the filament AFTER the first (random) cm of printheight. when i unload the filament the filament have grooves where the transportwheels are. if i reload the filament, it exits instantly extrudes with the right color and without clicking.

The filament doesn't matter at all. (i used prusament, das filament and random filament from amazon) all PLA.

if i disasamble the head, nothing obvius is shown.

sorry about my bad english.

Posted : 28/07/2019 10:02 am
cwbullet
(@cwbullet)
Illustrious Member
RE: Filament stuck during print

Check to make sure your PTFE tube is all the way in.  

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Chuck H
3D Printer Review Blog...
Posted : 28/07/2019 11:59 am
thomas.k25
(@thomas-k25)
Active Member
Topic starter answered:
RE: Filament stuck during print
Posted by: charles.h13

Check to make sure your PTFE tube is all the way in.  

i remove the printhead and reentered the ptfe tube. a new testprint ist on the way.

 

thnx for the sugesstion.  ( i am partitialy shure that i done this last time, but not fully....)

greetings, thomas

Posted : 28/07/2019 1:17 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: Filament stuck during print

I have had similar experiences in the last couple of weeks.  I was using ABS filament and ti always happened with the same filament.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 28/07/2019 1:30 pm
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(@)
Illustrious Member
RE: Filament stuck during print

After a jam unload the filament and inspect the stub at the end.  If the stub is >2.0 mm diameter, the heat break is affecting you.

Also, when assembling the hot end after replacing parts, it is common for users to make mistakes and not assemble the parts correctly. For example, often the nozzle is inserted into the heater block too far.  This causes the heat break to be too high and the melt zone is too high in the heat break and additional filament drag is the result. It also leads to improper torque contact between the nozzle and the heat break, and melt can extrude past the threads.

It may also be that summer is here and your room is warmer. This leads to problems, too.

Posted : 28/07/2019 5:03 pm
thomas.k25
(@thomas-k25)
Active Member
Topic starter answered:
RE: Filament stuck during print

Hi Folks,

ok, the problem still exists..

 

the filament looks like this:

 

Posted : 28/07/2019 6:07 pm
JoanTabb
(@joantabb)
Moderator
RE: Filament stuck during print

Hi Thomas, 

 

If you choose the Link to: Media File, the pictures will open up larger whe clicked. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 28/07/2019 6:43 pm
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(@)
Illustrious Member
RE: Filament stuck during print

You should replace your heat break with the standard E3D-V6 version.

Posted : 28/07/2019 6:46 pm
thomas.k25
(@thomas-k25)
Active Member
Topic starter answered:
RE: Filament stuck during print

hmmm. is it better now ? 🙂

Posted : 28/07/2019 7:08 pm
JoanTabb
(@joantabb)
Moderator
RE: Filament stuck during print

Yes it's better in that I can see the picture in more detail. 
does this happen on both pre sliced example models and self sliced models?, are you using Prusa Slicer 2?

I am stumped as to what is causing that effect... 

I see 4 issues...
1, at the bottom, you have a blob... from the nozzle/heatbreak melt zone
above that you have
2, some unexpected disturbed surface roughness( possibly at the level of the ptfe/ heatbreak reduced diameter), then
a smooth section, then
3, another area of disturbed surface. which is really odd as there shouldn't be  anything in and that area to cause problems...
and finally at the top, there is
4, the narrowed section where the bondtech gears have eaten away the filament...

does the surface roughness rub off easily (items 2 & 3) , between the bottom blob and the worn away area?
I think they are unimportant... 

the blob at the bottom may be caused by lots of repeated retractions.

could you try again,  but reduce the retractions to say 0.4mm?.

. Regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 28/07/2019 7:32 pm
thomas.k25
(@thomas-k25)
Active Member
Topic starter answered:
RE: Filament stuck during print
Hi, thanx for the detailed answer 🙂
Posted by: joan.t

Yes it's better in that I can see the picture in more detail. 
does this happen on both pre sliced example models and self sliced models?, are you using Prusa Slicer 2?

first, i used simplify3d as usaly. but due to the error i used prusa slicer 2 with stock settings (and prusa filament instead of my trusted dasfilament filament.)

I am stumped as to what is causing that effect... 

I see 4 issues...
1, at the bottom, you have a blob... from the nozzle/heatbreak melt zone
above that you have
2, some unexpected disturbed surface roughness( possibly at the level of the ptfe/ heatbreak reduced diameter), then
a smooth section, then
3, another area of disturbed surface. which is really odd as there shouldn't be  anything in and that area to cause problems...
and finally at the top, there is
4, the narrowed section where the bondtech gears have eaten away the filament...

does the surface roughness rub off easily (items 2 & 3) , between the bottom blob and the worn away area?
I think they are unimportant... 

the blob at the bottom may be caused by lots of repeated retractions.

could you try again,  but reduce the retractions to say 0.4mm?.

. Regards Joan

i think about to drop the complete (new) printhead and use my second spareparts. (beside the heat element and the thermistor) 

i think also the  roughness is a thing of the  boden gears - i should check the heat of the head with another termistor to prevent a false heating or overheating... but i dont think this is the case. 

a posibility is a wrong nozzelsize ? (to small)

greetings thomas

Posted : 28/07/2019 8:13 pm
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(@)
Illustrious Member
RE: Filament stuck during print

The surface abrasion are areas where the extruder was struggling to push filament, but eventually got past that region, then finally hit a region where the extruder made enough noise the print was stopped - producing the stub seen here.  I'd not worry about the debris on the filament, it's the stuff that slipped past as the filament was removed and is now inside the heat break that can collect and cause another type of clog.

 

Posted : 28/07/2019 9:02 pm
happyprinting3d
(@happyprinting3d)
Active Member
RE: Filament stuck during print

Yes, it seems fine now.

May be the problem is with the filament its diameter is not proper. Though many manufacturers claims it is equal but it seems to have some problem.

Posted : 29/07/2019 7:01 am
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