Nozzle .15mm blowout

Discussion in 'General' started by TstarkEngineering, Jan 1, 2018.

  1. TstarkEngineering

    TstarkEngineering Well-Known Member

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    Ive had a second nozzle what now appears to be blowout out of the side of the orafice. Has anyone else had this happen?
     
  2. Old_Tafr

    Old_Tafr Well-Known Member

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    Which "orifice" ? :)
     
  3. TstarkEngineering

    TstarkEngineering Well-Known Member

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    In the actual tapered part of the nozzle right near the actual exit where material is extruded. At first i thought it was walking up the wall and appeared to be a blowout. But i held something between the exit and where i thought it might be a hole and material just oozes out...its so hard to still tell because material is everywhere on the nozzle.
     
  4. Ephemeris

    Ephemeris Well-Known Member

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    I've only heard of bore erosion. I"d love to see a picture!

    Maybe run some ABS through, remove the nozzle, clean it in acetone, hit it with a torch to clean any remaining residue, then take a picture? Okay that might be a lot of trouble just to satisfy my curiosity :)
     
  5. TstarkEngineering

    TstarkEngineering Well-Known Member

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    Ill try my best :)
     
  6. TstarkEngineering

    TstarkEngineering Well-Known Member

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    Heres 1
     

    Attached Files:

    Ephemeris likes this.
  7. TstarkEngineering

    TstarkEngineering Well-Known Member

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  8. TstarkEngineering

    TstarkEngineering Well-Known Member

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  9. jfb

    jfb Well-Known Member

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    Wow!

    I really wouldn't have expected that to happen. I'd be surprised if the extruder could generate enough force to do that without a material or manufacturing defect - but I am neither an engineer nor a materials scientist, so I may be talking utter crap!

    What sort of speed were you printing at? Presumably a lower speed would be lower pressure etc...

    In any case, I'll be interested to learn what the cause is and what the fix should be.

    Thanks for the photos - educational.
     
  10. TstarkEngineering

    TstarkEngineering Well-Known Member

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    I have 2 nozzles like this. They have never crashed or anything. Slow speeds under 20mm/s.
     
  11. Ephemeris

    Ephemeris Well-Known Member

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    :eek: I'll be damned :eek:

    If I had to guess I'd say bad metallurgy, like a huge inclusion. I've see incredibly bad cast iron from Chinese manufacturers and I know what passes for 'brass' is often way too much zinc, but damn...
     
  12. TstarkEngineering

    TstarkEngineering Well-Known Member

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    Right...haha so ill be placing an order for 2 more here with you this weekend

     
  13. jfb

    jfb Well-Known Member

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    Got to agree it looks like bad materials. From some video I saw on youtube a few days ago (sorry, can't find it now) 20mm/s should be fine, so that leaves poor materials or manufacturing flaw - though I have to admit I can't think of any way to screw up drilling a hole quite that badly :)
     
  14. Paul Winter

    Paul Winter Well-Known Member

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    A suggestion, for what it's worth:
    Once the nozzle is screwed back into the heater block, scratch a mark on the hex part of the nozzle to indicate which way is front once the nozzle is mounted. Then, if the blowout happens again it will aid in diagnosing whether some third-party operation is causing the problem i.e. nozzle cleaning/wiping.
     
  15. Antoine

    Antoine Well-Known Member
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    Just a few questions so that we can investigate on our end:
    -3mm or 1.75?
    -What material/temperature?
    -How long has this nozzle been printing for?
    -When did you purchase this nozzle?
    -Did this happen to both of your nozzles?
     
  16. TstarkEngineering

    TstarkEngineering Well-Known Member

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    1.75mm
    I've used a range of materials I can't necessarily tell you what has been through the nozzle
    Nozzle has been printing for since the first release of the .15mm nozzle (not sure how long its been since that)
    Purchased 2 nozzles at once right after release
    Pretty sure its on both nozzles however I have only cleaned and inspected one. I have another .15mm nozzle that was purchased at a later time that has not had any cracks at this time. I have a pretty large inventory of nozzles and this is the only one I have seen this on.

    I purchased some more nozzles and will mark the nozzle, however it can travel among 3 different printers.

    Its making its way to Tim to cut open.

    Thanks,

    Tyler
     
  17. Antoine

    Antoine Well-Known Member
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    Well the geometry of the cone was changed after the launch of the nozzle to make the machining process easier, more precise and more reliable. From the pictures, you do have one of the original ones (no dots on the flats, "old" cone design). The current ones have a slightly redesigned tip and two dots on one flat. I will cut one of our current 1.75mm in half and update this thread if I find any issue, but this is the first time we've heard of this kind of failure.
     
  18. TstarkEngineering

    TstarkEngineering Well-Known Member

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    Just curious if anyone has gotten around to cutting it open yet
     
  19. elmoret

    elmoret Administrator

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    Just received it in today, it'll be a few weeks before we have time to cut it open.
     
  20. Antoine

    Antoine Well-Known Member
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    Yes I have, the newer ones do not show any defect, neither do the ones from the old batch. A bad batch must have made it through, sorry. If you email support@e3d-online.com I am sure they can sort you out with a replacement.
     

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