Hemera jaming with Fillamentum Vertigo Galaxy filament.

Discussion in 'HotEnds & Extruders' started by Mohcine, Apr 1, 2020.

  1. Mohcine

    Mohcine Member

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    Hi verybody,

    I have an Hemera direct drive with a "Nozzle X V6".
    Since the begininng it is working well. I was able to print object with more than 40 hours duration.
    Now I am using a beautifull filament the "Fillamentum Vertigo Galaxy" and I don't know why after some minutes the extruse is jaming.
    I tried from 205 to 220ÂșC.
    Printing at 0.1.
    Retract on 0.35 mm at 45 mm/s).

    When it happen, I was not able to extrude manually the filament using the printer interface.
    To unlock the situation, I retract 10 mm and after that I extrude 10 mm or more.

    I do not understand this phenomemon. I don't think that it is a problem on Hemera itself but not sure.

    I will appreciate your help.
     
  2. Spoon Unit

    Spoon Unit Well-Known Member

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    I have printed the same stuff on the Hemera without issue, same nozzle. I'm using 2mm retractions and printing at typically 0.3 layer height or 0.2, never 0.1. Nozzle temperature same range as you (laye rone 220, subsequent layers at 205). Not sure what to suggest. Is it only this filament? Is the nozzle clear?
     
  3. Mohcine

    Mohcine Member

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    Hi Spoon,

    Thank-you for your feeback
    My ratrction is 0.8 mm.
    I have found one strange thing. It seems that the problem is due to the extrusion. See the joinded picture, they are a "ball" at 2cm.
    It has be difficult to remvove the filament from the bowden
    Regarding the picture, could you please comment it ?

    Regards. 20200403_183053.jpg
     
  4. Spoon Unit

    Spoon Unit Well-Known Member

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    Are you cooling the Hemera with the delivered fan at the correct voltage?
     
  5. Mohcine

    Mohcine Member

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    I followed some recommandation regarding the voltage (I don't remember it) and the Hemera temperature seems correct (I can touch it and stay my finger on it).
    Regarding the cooling I use this fan https://www.tme.eu/hr/en/details/mf40202v2-a99-a/dc24v-fans/sunon/mf40202v2-1000u-a99/
    See this discussion: https://forum.e3d-online.com/threads/hemera-heatsink-cooling.3536/

    By analyzing the situatio/
    - printing is ok when I use PLA filament like GEETECH and SUNLU.
    - printing faile when I use FILAMENTUM PLA Extrafill VERTIGO GALAXY.
    The Vertigo Galaxy is more rough compared to the Geetech which is very smooth.

    My printer is located in an enclosure. The filament is located at the bottom of the enclosure. It is going up to the printer trought guides and bowden (arround 50 cm of bowden).

    I think that the problem could be due to this big filament guide installation.

    Your opinion will be helpfull.

    Also, You said that you use 2mm retractions. What is your retaction speed?

    Thanks.
     
  6. Spoon Unit

    Spoon Unit Well-Known Member

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    I think your problem is probably that you're not using the fan that came with the Hemera. If you still have that one, refit it and see if your problem persists.

    Your fan, if I follow the documentation link, shows this

    upload_2020-4-4_21-23-50.png

    The one supplied with the Hemera shows this:

    upload_2020-4-4_21-26-53.png

    If we believe all this, it looks like your fan is pushing more air. But in the thread you link, Thorinair says:

    "Having them blow side by side, it feels like the Hemera's fan blows much more air."

    Heatbreak cooling is essential for smooth operation in order to stop filament deforming and bulging, as that leads to jamming, which is what you're experiencing. Furthermore, your filament looks like the bulge length is about the length of the heatbreak. You also say it doesn't happen straight away, so it seems that this happens after the heatsink warms up too much. I haven't touched my heatsink when in full operation as I haven't had an issues so far so haven't had to troubleshoot this issue.

    As you say, the filamentum is more rough, because it has content; the sparkly stuff. That should be no problem though as you have the nozzle to handle it.

    You also say that your printer is in an enclosure, so that's also raising the heat further during printing. If your printer is in an enclosure, I presume that dampens the sound quite a bit, so another good reason to return to the stock fan. My settings for Hemera retraction in are these;

    M207 S2.0 R0.0 F5500 T5500 Z0.5

    In case you don't have a duet, here's the M207 link.
     

    Attached Files:

  7. Mohcine

    Mohcine Member

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    Hi Spoon,

    Thank-you for the spent to help me.
    For your information I have modified my filament installtion. I have minimized the lenght and removed the bowden (40 cm).
    Now, I am able to print the FILAMENTUM PLA Extrafill VERTIGO GALAXY correctly.
    Everything is correct.

    I will take care about fan and if the problem happen again I will reinstall the stock Hemera fan.

    One question regarding your retraction parameters, are you using these parameters for all your filament or only for filament like FILAMENTUM PLA Extrafill VERTIGO GALAXY.

    Best regards.
     
  8. Spoon Unit

    Spoon Unit Well-Known Member

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    Those are my settings for the Hemera. They're not finely tuned for a specific print or this filament. I've used the for standard PLA, the Filamentum Vertigo, MG94 ABS, and ASA so far. They seem to work pretty well.

    Glad you got your issue fixed. Begins to sound like it really was getting caught in your tube. FWIW, I'm using a feeder tube that was first delivered with the BigBox and is not longer for sale on the e3d website. This had a larger ID than the bowden tubing, which I figured would make it all but impossible to print TPU when I next find the need. So, that was another difference perhaps if you were using bowden tubing with ID 2mm.
     
  9. Haytham Bennani

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    Try slower retraction speeds. I found better results with 25mm/s instead of 40+ with the same filament. It can print from as low as 190 to 230. I usually print .6 width / .4 layer height / 120 mm/s (28.8 mm3/s) with a volcano block with these settings. Retracting 2mm on the Volcano block works best for me. And make sure the idler tension isn't super tight. That also will cause the Hemera to jam up since it will be putting so much force onto the filament the bowden coupling will start bouncing up and down. It does its job too well sometimes! :)
     

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