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Extruder stops extruding filament

Discussion in 'Troubleshooting' started by Robert Choban, Nov 5, 2014.

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  1. Robert Choban

    Robert Choban Active Member

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    I can print the calibration box and it looks good. But if I print for more than 30 to 45 min the extruder will stop forwarding the filament. I have had to fix some problems with the Hexagon hot end and have replace the thermistor. So I have done some work in the area of the extruder, but have not change anything on the extruder. I have a Robo R1 with the enclose bottom. I use standard Colorfab PLA filament from Printed Solid. I print in PLA, my hot end temp is 210c and my bed is 55c. I am trying to print the Thinking man from thingsiverse. should be about a 5hr print. After about 30 min the filament stop feed through the extruder hobble bolt. When I pull out the filament I can see where the hobble blot is biting into the filament. I think the problem maybe with the tension on screws that hold the filament against the hobble bold, I see the screws for increasing or decreasing the tension, but how do you know how lite or tight you should set them? The pictures are of my printer and filament setup. I don't think the filament is binding, I check it often and it seems to be rolling of the filament reel freely.
    Any help or suggestions are appreciated.
     

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  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Start with seasoning the hotend. PLA can be sticky and cause this sort of failure.

    I had a few batches that were worse for whatever reason and just added an oiler and moved on.
     
  3. Robert Choban

    Robert Choban Active Member

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    mark is there anything I need to check out with how much preasure is being put on the filament as it rolls across the hobble bolt. This had been working, it stopped after I removed the hot end to replace the thermistor, I can print for a short period of time, 15 - 30min then the filament stops being fed through the extruder. Is there a thread that talks about how to season the hot end.
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    http://johnridley.blogspot.com/2014/06/nozzle-seasoning.html

    Pretty generic, not Robo specific.

    If the seasoning helps you will want to consider an oiler (which is just a way to coat the filament with a thin layer of oil as it feeds--constant seasoning). You can print one, add a sponge, add some oil and forget about it.
     
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    It does vary too -- I spent almost a year printing ABS and PLA with never a jam and then... once it started it just wouldn't stop.
    It likely corresponded to me swapping nozzles, but once I did this it has not happened again. I just add a few drops of canola to the oiler every week and life is good.
     
  6. Robert Choban

    Robert Choban Active Member

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    Thanks for your help, I will season the hotend and let you know how it goes, is there a permanent seasoner that I can print from thingiverse. One that you like or use?
    Do you know what type of hobble bolt Robo is using on it's new printers with the Hexagon hot end, is this something I should look at replacing. I was reading on the forums about the old ones being a problem?
     
  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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  8. Robert Choban

    Robert Choban Active Member

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    Mark is there a way I can determine if the tension that holes the filament against the hobble bolt is to loose or to tight.
     
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I am not sure. By that I mean I am not sure that too tight matters. I have always kept the screw in as tight as they would go and that has not been a problem. Too loose would be a problem, someone else had mentioned that they either replaced the springs or added additional ones.
     
  10. Printed Solid

    Printed Solid Volunteer Admin
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    I think the oiler will fix it. There were some batches that shipped with out of spec springs, but judging by the divot in your filament, you are probably tight enough. Just make sure to clean all the grooves in your hob really well after it does that.
    You might also want to check to make sure you're not running excessively high values of retraction. a few mm is probably enough for a direct drive.
     
  11. SteveC

    SteveC Well-Known Member

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    Robert,
    Did you ever put in a new hobbed bolt? Can you post a photo of your current one?
     
  12. Robert Choban

    Robert Choban Active Member

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    Steve, I'm using the original hobble bolt that came with this ROBO 3D printer. This is a newer printer, it came with the hexagon hot end and the enclosed bottom. I'm not sure what hobble bolt is being used on this printer.
     
  13. Kelvin James

    Kelvin James New Member

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    Robert, I had the same problems and I done exactly what Mark said about seasoning the hot end, and after I cleaned everything I have been printing for hours and no more jamming.
     
  14. SteveC

    SteveC Well-Known Member

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    Can you post a photo of the hobbed portion. From what I have seen they are still shipping the same bolt design with sharp angled hobbs on it. I suggest that you replace it because it tends to slice through the filament if there is a bit of back pressure from the hot end. Radial hobbs like on the ebay bolts work much better.
     
    #14 SteveC, Nov 9, 2014
    Last edited by a moderator: Nov 9, 2014
  15. Mike Kelly

    Mike Kelly Volunteer

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    I think you might get some disagreement on that.
     
  16. SteveC

    SteveC Well-Known Member

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    Sure someone can disagree, do you? My opinion is that slicing into the filament at an angle is is a good way to take chunks out of it and poor way to grip it. I agree that all I have is anecdotal evidence from this forum and my observations. My original bolt would easily accumulate plastic shavings, my radially hobbed bolt does not do this at all after a year of use.
     
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  17. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I agree, the ones I replaced the original with are all slightly different from each other, but they are alike in that regard and never demonstrated the same sort of behaviors.
     
  18. Galaxius

    Galaxius Well-Known Member

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    It would be better to mount your spool above the printer and have it rolling on bearings. The more the extruder has to pull the filament from the spool the more likely it will chew it. The less resistance you have for the extruder to pull the filament the better.
     
  19. SteveC

    SteveC Well-Known Member

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    Galaxius,
    Originally I threw out the Robo3D's side mount and designed a top mount ball bearing based one. The ball bearings made it spin much too easily. I also did not like that the spool could fall into and smash my bed. I then designed a robust side mount one which just spun on a PVC pipe over a brass threaded rod. I have had not any issue with the resistance. Perhaps it is because my radial hobbed bolt has no problems pulling it :).

    (Edit- Forgot to add the link to the side mount: http://www.thingiverse.com/thing:516790)
     
    #19 SteveC, Nov 10, 2014
    Last edited by a moderator: Nov 10, 2014
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  20. Kelvin James

    Kelvin James New Member

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    SteveC, where did you get you radial hobbed bolt?
     
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