Filament stuck inside

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sgeolog
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Filament stuck inside

Postby sgeolog » Mon Jul 31, 2017 1:51 pm

Hello,

I need some help. I was printing 22 hours piece and after 18 hours it stop extruding. It looks like filament broke or something happened inside. I tried to pull it out but no luck at all. Even when I removed motor from there cannot remove filament from it. Please I need some ideas.
Thank you
Sergey
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Jetguy
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Re: Filament stuck inside

Postby Jetguy » Mon Jul 31, 2017 2:24 pm

Sounds like you have a jam inside the cold section of the hotend. Remember there are 2 parts to a hotend.
You have the hot part being the heater block and nozzle and the COLD part, being the throat tube and the heatsink to cool it.
IF your fan stopped or some other reason like a retract pulled melted filament into the cold section, then it locks inside the throat tube.

That means, to clear this type of jam, you either intentionally unplug the fan while preheating the hotend to no more than 200C, wait 5-10 minutes and then ALWAYS try to push DOWN first before pulling filament up. Again, you need to push this jam into the hot melting zone first.

Other possible answer again related to the above cooling problem is that the filament jammed in the space between the PTFE guide and the actual entrance to the hotend. THAT jam can ONLY be removed by loosening the hotend, allowing it to drop down, and pulling the filament out of the bottom, then installing the hotend and leveling the nozzles.
If you want to avoid leveling the nozzles, you can loosen the 4 really long screws on top of the central crossing block and that drops the entire plate off. with BOTH nozzles attached.

Jetguy
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Re: Filament stuck inside

Postby Jetguy » Mon Jul 31, 2017 2:36 pm

See this thread for some pictures viewtopic.php?f=8&t=1907#p15811

And here described the potential gap above the hotend but below the exit of the PTFE guide viewtopic.php?f=4&t=2276&p=16791&hilit=ptfe+guide#p16789

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Mon Jul 31, 2017 3:10 pm

Thank you. First option does not work. I removed hot end and see that filament stuck there

Jetguy
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Re: Filament stuck inside

Postby Jetguy » Mon Jul 31, 2017 4:08 pm

Pictures?
Kinda hard to help further, I gave the best answers I know.
If the hotend is jammed in the cold end, you let the cold end get hot and the filament can come out.

How you do that was covered in this entire thread viewtopic.php?f=8&t=1907

Alternatively, heat the ENTIRE hotend including heatsink externally using a propane or butane torch.

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Mon Jul 31, 2017 7:19 pm

Jetguy, thank you. It works now. I heat hot end, removed nozzle and filament was inside of hot end. I heat it and slowly pull out filament. After repeating it few times I pull filament out. Then put back nozzle and it is running again. Thank you

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Mon Jul 31, 2017 8:20 pm

It is happened again. Maybe it is happening because i am running Makerbot filament?
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NewGuy
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Re: Filament stuck inside

Postby NewGuy » Mon Jul 31, 2017 9:10 pm

sgeolog wrote:It is happened again. Maybe it is happening because i am running Makerbot filament?


Difficult to say. I never seen to have a problem using raise filament but something always seems to go wrong with third party stuff.

I would check the filament diameter at a few spots to see if it is consistent. I don't how you store your filament but if it absorbs moisture it can expand, which makes a huge difference when printing with it.

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Vicky@Raise3D
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Re: Filament stuck inside

Postby Vicky@Raise3D » Tue Aug 01, 2017 8:14 am

Have you checked the throat tube cooling fans as Jetguy said?
Are the fans keeping on blowing cooling air to the heat sink?

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Tue Aug 01, 2017 12:45 pm

Hello Guys,
I printed with Makerbot filament but so big details. This time detail was bid and after 15+ hours of printing it happened. Of course I am not professional to fix Raise 3D but looks ok to me. Now I will print different detail with different filament.

Thanks

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Tue Aug 01, 2017 2:45 pm

I am printing third detail now and what I see is temperature is dropping sometimes about 10-13 degrees.

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Vicky@Raise3D
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Re: Filament stuck inside

Postby Vicky@Raise3D » Wed Aug 02, 2017 6:45 am

Do you mean the nozzle temperature has over 10C up or down changes during printing? Drop down, then raise up, then drop down.
Do two nozzles both have such problem during printing?

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Wed Aug 02, 2017 12:09 pm

No. I am printing for now with one nozzle and temperature is set to 205 but it was printing with temperature from 190 to 196.

firesped
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Re: Filament stuck inside

Postby firesped » Wed Aug 02, 2017 12:52 pm

this may be related to the issue I just posted on. the cable to the extruder board may have come loose causing the printer to get false readings.
RL name: Michael Nolen
printers:
raise3D N2 kickstarter Early Bird
Trinus Deluxe (running smoothieware on Azteeg X5 GT board)
Monoprice Maker Select v2

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Vicky@Raise3D
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Re: Filament stuck inside

Postby Vicky@Raise3D » Thu Aug 03, 2017 8:46 am

Is that mean after preheating before printing, nozzle never reaches the target value any more?
I would recommend you to try PID tuning first: viewtopic.php?f=4&t=1505&p=15761&hilit=PID#p15761

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Thu Aug 03, 2017 7:10 pm

When I load filament and preheating before print, temperature is ok. It drops during printing.

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Vicky@Raise3D
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Re: Filament stuck inside

Postby Vicky@Raise3D » Fri Aug 04, 2017 9:38 am

Will it raise to over 200C again during the whole printing? If load or preheat for very long time, will the temperature go such down?
Have you tried PID? Does it help?

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Fri Aug 04, 2017 7:55 pm

I did not get there yet. I had more problems. Hopefully I fixed everything and now I can back to temperature problem. What happen now is Left extruder dropping temperature (20 degrees from original) and it is not stable. It is changing all the time; down and up, down and up. right extruder is holding temperature very well (209-210). I believe firesped explained that problem. Vicky, can you please send me a picture of hot element and other wire? I believe that wire has to be connected to cylinder which goes to aluminum piece. I have only wire, it is why it does not connected well.

Thank you guys.
Still waiting for advises.

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Vicky@Raise3D
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Re: Filament stuck inside

Postby Vicky@Raise3D » Tue Aug 08, 2017 2:28 am

What firesped mentioned should be this cable.
One end on extruder board, and the other on motion board.
1.png
2.png


And heating rods' connections.
3.png


Thermalcouplers' connections.
4.png

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sgeolog
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Re: Filament stuck inside

Postby sgeolog » Tue Aug 08, 2017 6:50 pm

I will check but I don't think so. I ordered Thermocoupler and will change it and see what it works. Now I set temperature to 220 and it prints with 205-210 which is ok.

Thank you


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