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Sebastian
(@sebastian-3)
Trusted Member
Extruder Clogged

Hi at all,

i get my new I3 MK3. ANd after I finished the assambling I start to print the firt models. And now I am very disapointed. everytime after 1 or 2 houres the Extruder start to clogging. I print with a 0.4mm nozzel and 0.1mm layer. I try to change the Temp from 215°C to 220°C and 200°C and 195°C. But everytime Clogging after a few houres.

What did I wrong? Please can someone help my 🙁

best regards
Sebastian

Opublikowany : 30/07/2018 7:11 pm
bobstro
(@bobstro)
Illustrious Member
Re: Extruder Clogged

A couple of quick qualifier questions:

  • Are you printing in an enclosure?

  • Are you printing in unusually warm conditions?

  • Are you printing via Octoprint or similar?
  • Those really change the variables.

    Can you summarize your print & slicer settings?

    It sounds like you're getting filament flow, so a partial clog is a possibility. If you heat up to printing temp, raise Z to max and extrude material, does it flow straight out of the nozzle, or angle to one side as it comes out? There may be a bit of build-up initially, but once it starts flowing, it should come straight out of the nozzle.

    Is it clogging consistently at any particular part of the print? Is it printing a lot of small pieces (e.g. fingers)? Do you hear a lot of retraction going on?

    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

    Opublikowany : 30/07/2018 9:57 pm
    Sebastian
    (@sebastian-3)
    Trusted Member
    Topic starter answered:
    Re: Extruder Clogged

    Hi,

    I do not have an enclosure and I wait till the bed and the Extruder is warm up to 215°C Extruder and 60°C for the bed. I use the Pronterface to print via USB.
    I have a 0.4 Nozzel and it happend if I select 0.1mm layer after 1 or 2h of printing.
    It starts with a clicking noise of the Motor. If I stop the printing an reverse some of the filament (approx. 5mm) an extrude new material the clog disappear. But I have to restart the print.
    After reversing some material and extruding material the filament comes straight out of the nozzel.
    With the slic3r tool I select for every layer a revers of 0.8mm. could this cause the clog? Or is the layer with 0.1mm to thin?

    best regards
    Sebastian

    PS. English is not my native tongue, so I hope everyone could understand me 🙂

    Opublikowany : 31/07/2018 6:28 am
    RH_Dreambox
    (@rh_dreambox)
    Prominent Member
    Re: Extruder Clogged

    Why not print from the SD card to see if it helps. There may be some strange phenomena when printing through the USB port.

    Bear MK3 with Bondtech extruder

    Opublikowany : 31/07/2018 10:05 am
    Sebastian
    (@sebastian-3)
    Trusted Member
    Topic starter answered:
    Re: Extruder Clogged

    Realy? The case is that I do not have a SD Card writer. Therefore I use the USB. But why the USB should creat failure?

    Opublikowany : 31/07/2018 10:59 am
    RH_Dreambox
    (@rh_dreambox)
    Prominent Member
    Re: Extruder Clogged

    There has been a number written on the Forum about problems writing via the USB port.
    Could it be that your computer tries to go into sleepmode after 1 to 2 hours.
    There may be interference in communication that causes the extruder to work incorrectly.

    Bear MK3 with Bondtech extruder

    Opublikowany : 31/07/2018 1:12 pm
    Sebastian
    (@sebastian-3)
    Trusted Member
    Topic starter answered:
    Re: Extruder Clogged

    Ah okay. But my computer do not have a sleep mode. it is disabled

    Opublikowany : 31/07/2018 3:09 pm
    bobstro
    (@bobstro)
    Illustrious Member
    Re: Extruder Clogged


    Ah okay. But my computer do not have a sleep mode. it is disabled
    There are all kinds of possible issues that adding a computer to the process can complicate. Eliminating the computer as a possible problem is an excellent 1st troubleshooting step. I'd suggest you buy an inexpensive SD card reader and test this possibility out.

    The next thing I'd suggest is simply slowing everything down. Reduce your speeds way down -- something like 50% -- and try the same print. If that works, you know you can work around the problem with slicer settings. A lot of people are having heat-related problems this time of year. You can print out the new extruder housing, but in the meantime, just slowing down might help.

    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

    Opublikowany : 31/07/2018 5:06 pm
    RufusClupea
    (@rufusclupea)
    Reputable Member
    Re: Extruder Clogged

    My first thought was, if the computer is connected to the 3D printer via USB, why can't the computer see & write to the SD card? Then I tried it. Our PC not only can't see the SD card in the MK3, it can't even see the MK3. 😕 (Yes, we turned the MK3 on, and established connection via Pronter McProntface... no luck.)

    Sebastian, does your 2D printer (or any other peripherals) have an SD port? Our last computer had no SD port either, but our 2D printer did, and that worked for reading/writing to an SD card. We also have a GPS unit with an SD card that works the same way. Many/most HD TVs now have SD ports as well.

    Look around...think about what else you might have that has an SD port that you can connect to via USB.

    Just a suggestion. 🙂

    That's "MISTER Old Fart" to you!

    Opublikowany : 31/07/2018 5:45 pm
    RufusClupea
    (@rufusclupea)
    Reputable Member
    Re: Extruder Clogged


    There are all kinds of possible issues that adding a computer to the process can complicate. Eliminating the computer as a possible problem is an excellent 1st troubleshooting step.

    😆 😆 😆 Sorry... With all the problems we've had with prints/the SD card crapping out in the middle of a print, we've had to go the other way. Since printing via USB, we've had no such problems (knock wood-filled PLA?) 😀

    That's "MISTER Old Fart" to you!

    Opublikowany : 31/07/2018 5:49 pm
    toaf
     toaf
    (@toaf)
    Noble Member
    Re: Extruder Clogged

    for fun try slicing in prusa control. its worth a shot. make sure you reload filament before you start.

    I have a Prusa,therefore I research.

    Opublikowany : 02/08/2018 12:26 am
    Sebastian
    (@sebastian-3)
    Trusted Member
    Topic starter answered:
    Re: Extruder Clogged

    I try it with Prusa Control, and Slic3r. I Print with Pronterface. What I realized is, that the Extruder Motor is geating realy hot. So hot that it hurts if I touch the motor. Could that be a Problem? And It seems, that If the Printer is printing an Infill, the Printer start clogging. So I slow down the printing speed for Infill to 50mm/s. But that dosnt work :-(.

    What else can I do? 🙁

    I am very disapointed

    Opublikowany : 03/08/2018 6:11 am
    bobstro
    (@bobstro)
    Illustrious Member
    Re: Extruder Clogged


    I try it with Prusa Control, and Slic3r. I Print with Pronterface. What I realized is, that the Extruder Motor is geating realy hot. So hot that it hurts if I touch the motor. Could that be a Problem?
    Yes, it could be a problem. If it gets too hot, heat gets into the extruder and the filament can soften before it gets into the hotend, resulting in jams or various extruder problems. You could have something mechanical causing the extruder motor to work extra hard, but I'd try a few things 1st. Try these in order:

  • Is the STL model you're printing very thin or have many small parts near where it starts clogging and clicking? Can you post a picture? Specific recommendations will depend on what you're printing.

  • Did you try slicing with PrusaControl?

  • Is the room hot? What is the temperature in the room you're printing in? Can you cool the room or printer down, or at least improve air circulation?

  • You mentioned you're using Slic3r with 0.8mm retraction length. That is fine. However, excessive retractions work the extruder motor more, causing it to warm up. Retractions also pull filament up, and you may be getting "heat creep", although at 0.8mm you should be OK. You could try increasing Printer Settings->Extruder 1->Retraction->Minimum travel after retraction so it doesn't do retraction for short moves. Prusa defaults to 1. Try a higher setting, maybe 5. It may string more, but if it completes without jamming, you can work on the stringing.

  • You could try setting Print Settings->Speed->Autospeed (advanced)->Max volumetric speed to something less than 11.5. Try 8 and see if it still happens. This will throttle the amount of filament the extruder tries to push through the hotend in a given period. 11.5 is the maximum the E3D V6 can handle. Prusa doesn't set a limit for print settings, and their default for PLA is 15, which is very aggressive. Slowing the feed rate down can help. This one is tricky because slowing things down will help in some cases, but not others.
  • You could have a partial jam, but it sounds like it prints well until it jams. Is that correct?

    Prusa has put out some new parts you can print that are supposed to help with using the printer in warm conditions. Search for the "R3 extruder parts" on these forums.

    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

    Opublikowany : 03/08/2018 7:23 am
    Sebastian
    (@sebastian-3)
    Trusted Member
    Topic starter answered:
    Re: Extruder Clogged

    Hi,

    yes I used Prusa Control for creating the G-code and Slic3r.
    The room Temp was 30-40°C. It's a hot summer, too hot for me.
    Her is a pic with clogging problem. You can see those littel "needles" or "fluff/lint" on top of the Model.
    It happens when the printer try to print infill.

    I will try your tip

    best regrads
    Sebastian

    Opublikowany : 03/08/2018 1:43 pm
    artem.b
    (@artem-b)
    Active Member
    Re: Extruder Clogged

    Hi, Since this week I'm experiencing similar issue - print fails in the middle after an hour or smth. Btw I've been printing with ZERO issues for the last month (since I assembled the MK3 kit)

    In my case I'm printing via SD card and this is not dependent on filament
    At the beginning I thought it's some under-extrusion, but then I noticed - when this happens and I stop the print I can't really push the filament down. But when I pull it back and then push it again it drops down fine...

    I love my MK3, just scratching my head in order to figure out what's causing the issue.
    room temp is 24-25 C

    Opublikowany : 05/08/2018 1:16 pm
    david.d59
    (@david-d59)
    New Member
    Re: Extruder Clogged

    I have a problem, that seams very similar to yours. My new printer also gets clogged after some hours of printing (well, thats at least what I guess that it does), but not always. After a while it continuous printing. Not always successfully regarding the missing layers. It's not always happening, but way too often. The problem is not producible 100% while doing the same print two times. The test prints I did from the SD card all worked fine so far (Frog 150, Batman, Bottle opener)

    The idea of overheating from bobstro seams reasonable to me. I also had printed an 8 hour model without problems, but there was no infill, only thin walls so the extruder didn't had to retract really much.

    I have the printer also in a room with about 30degree Celsius (thats at least what my prusa says).

    Here an example sliced with slic3r (standard settings with low speed first layer)

    Opublikowany : 05/08/2018 1:17 pm
    artem.b
    (@artem-b)
    Active Member
    Re: Extruder Clogged

    fuuuh... sims like I fixed my issue. after watching some videos on youtube on how to fix a partial clog of a nozzle.
    I've start a new print, will update if issue occurs again.

    what I did:
    exactly what that gentleman says
    PS: of course the service door has to be open

    here is what I got out:

    Opublikowany : 05/08/2018 2:14 pm
    Sebastian
    (@sebastian-3)
    Trusted Member
    Topic starter answered:
    Re: Extruder Clogged

    This weekend I could finish my first long prints without problems.

    But I had to disable the Retract option in Slic3r. So I sett the retract distance to 0.
    Now I have no problems with clogging and PLA.

    But why the retract option create such problems?

    best regrads

    Opublikowany : 06/08/2018 11:48 am
    bobstro
    (@bobstro)
    Illustrious Member
    Re: Extruder Clogged


    [...] But why the retract option create such problems?
    Two major possibilities come to mind:

  • You are retracting too far. Prusa defaults to 0.8mm in Slic3rPE (see Printer Settings->Extruder 1->Retraction->Length). If this is set too high, you could be pulling molten filament back up further into the extruder mechanism than necessary/desired, causing heat which can lead to plugs.

  • You are retracting too frequently. Rapid retractions, especially when making tiny moves between them, can cause the extruder motor to do a lot of extra work, which leads to heat, which lead to heat creep, which leads to skips and jams. Prusa defaults to a 1mm move required before retraction (see Printer Settings->Extruder 1->Retraction->Minimum travel after retraction) while Slice3r defaults to 2. You could try setting this higher to still do retractions on longer moves, but reduce rapid staccato retractions for short moves.
  • Add in these factors along with increased ambient temps in many places (along with factors such as enclosures and Octoprint) and you might just have hit a tipping point with your printer hardware. Backing off a bit may make all the difference, and hopefully reduce your extruder motor temps.

    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

    Opublikowany : 06/08/2018 3:11 pm
    bobstro
    (@bobstro)
    Illustrious Member
    Re: Extruder Clogged


    [...] But why the retract option create such problems?
    Two major possibilities come to mind:

  • You are retracting too far. Prusa defautls to 0.8mm in Slic3rPE (see Printer Settings->Extruder 1->Retraction->Length). If this is set too high, you could be pulling molten filament back up further into the extruder mechanism than necessary/desired, causing heat which can lead to plugs.

  • You are retracting too frequently. Rapid retractions, especially when making tiny moves between them, can cause the extruder motor to do a lot of extra work, which leads to heat, which lead to heat creep, which leads to skips and jams. Prusa defaults to a 1mm move required before retraction (see Printer Settings->Extruder 1->Retraction->Minimum travel after retraction) while Slice3r defaults to 2. You could try setting this higher to still do retractions on longer moves, but reduce rapid staccato retractions for short moves.
  • Add in these factors along with increased ambient temps in many places (along with factors such as enclosures and Octoprint) and you might just have hit a tipping point with your printer hardware. Backing off a bit may make all the difference, and hopefully reduce your extruder motor temps.

    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

    Opublikowany : 06/08/2018 3:11 pm
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