Palette 2 - print failed due to blocked buffer

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    Jonny Yeu

    That's no problem, let us know once you're back and able to record the video and we can look further into the issue. If we do find that there is an issue with the unit, we can have the unit sent back to our offices for repairs. On our end, I've asked our team to produce a print with similar pong logs and will share the information once it's available.

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    Picaboubx

    Hello or good evening, it depends on your reading time.

    It has been several months since I have been able to take care of solving the problems that prevent me from using my Palette 2 which I recently converted to Palette 2S.

    So, last Weekend, I went back to trying to calibrate this tool.
    The calibration seems to be going well but of course I still have 2 problems that prevent me from moving forward (as usual each time I think I have successfully resolved a difficulty, another one appears :-()

    First problem:
    The Buffer is systematically overflowed with each splice. The Palette screen also displays "Buffer Error 121". This does not stop the printing but the connection tube with the printer dislodges each time and I am therefore obliged to monitor constantly. In addition I suppose that this must more or less distort the measurements of ping and length of filaments.

    Second problem:
    When doing the 4 color calibration I have a splicing problem on one of the filaments. Splicing is not done at all.
    I tell myself that perhaps the problem is the weight of the spool (1Kg) which limits the entrainment of the filament in the 2S Palette and does not allow the incoming filament to sink into the waiting filament. Each time it seems to miss 1 or 2 mm.
    I will continue to make tests by changing this filament of place to see if the problem comes from the weight of the reel or the power of the Palette on entry 3 which currently receives this filament. I did not have this problem before converting to 2S.

    For now I would just like to be able to eliminate this problem of Buffer in permanent overload.

    Can you help me please ?

     

    To complete my post above, I would like to add to the previous discussions that the printing tests without Hub and with SD card were not more conclusive than all my previous tests via Chroma.
    My current calibration attempts are made with your online Canvas Slicer and my Octprint with the Canvas and Palette 2 plugin.

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    Jonny Yeu

    Hi Picaboubx, to address your questions:

    1. Error 121 occurs if the buffer collapses and Palette is not able to feed filament fast enough to replenish the buffer. What is your print speed? I would recommend lowering your speed for now to see if this helps to avoid the 121 error. Also, which version of Palette's firmware are you running? 
    2. Please calibrate using the updated 2-color calibration model (http://mm3d.co/dualcolor-keychain). This was re-designed to help troubleshoot calibration issues (http://mm3d.co/newkeychain-troubleshooting). Also, what are your splice tuning settings? Do you have Endurance Mode turned (http://mm3d.co/endurance)? If you're finding that it missed by 1-2 mm, I would suggest increasing your Compression factor by 2-3.
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    Picaboubx

    Good evening Jonny and Thank you for always being there to help

    To me what you call a "collapse" of the buffer memory is a lack of available filament to supply the printer.
    In my case it is not a question of a lack of filament in the buffer, but of an overflow of filament, which generates a loosening of the tube between the printer and the pallet.
    I had started (as since the beginning of my calibration tests last year) with a speed of 30mm / s but at this speed the excess of filament leaving the buffer outside the tube was up to 15 cm.
    So I am going to 70mm / s in printing speed (which is a bit the speed limit of my printer to get correct prints). Suddenly, the overflow of buffer is limited to 2 or 3 cm but always dislodges the connecting tube.

    I will try again to calibrate with the model you indicate, but frankly I am starting to tire and wonder if it will work one day and if I will not do better to resell the Palette 2. I have already used a lot of filament in pure loss.

    I haven't touched anything on the side of the splicing parameters which are the default. I will try this WE following your recommendation.
     
    cordially

     

    https://video.ploud.fr/videos/watch/c61b3502-7d73-45bc-97b4-ccfb1f413f5d

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    Jonny Yeu

    Good evening, Picaboubx, we appreciate your patience!

    Thank you for the video, it's definitely strange that your filament is overflowing in this manner. Could you please try and re-calibrate your Palette (http://mm3d.co/calibrate-p2) and share your SPC and PPM values afterwards? Also, is this testing being done with PLA or another material?

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    Picaboubx

    Good evening,

    Indeed, I hadn't thought of redoing a P2S calibration after the 2S update.

    So it's done with the results:

    Old SPC: 2.50
    New SPC: 2.44

    Old PPM: 38.58
    New PPM: 38.05

    All my work on P2S is done with the PLA filament of the same brand.

    So I'm going to start again in the calibration with the printer this WE.
    Do I have to relaunch a complete calibration starting with the 2-color model or the one I made previously remains valid?
    What do you advice me ?

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    Jonny Yeu

    Thanks for sharing. I would recommend factory resetting, then re-running the 2-color keychain calibration since you've re-done Palette calibration (http://mm3d.co/calibration-troubleshooting).

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    Picaboubx

    Hello,

    So I left with a new new new calibration (another one !!!).

    This time I calibrated the 2S pallet so no more problem of filament overflow (I should have thought about it before)

    (I also fixed the slice problem with compression at +3.)

    But on the other hand I now have the opposite when my basic printing speed is only 30mm / s and I am on the first layer therefore with a lower speed.

    But there I think there is really a problem or a bug because the buffer is blocked and the sensor does not seem to do its job.

    See the 2 videos below:

    Example 1: https://video.ploud.fr/videos/watch/d8e6cd07-66d5-4980-a657-a7aff2ed8fd8

    Example 2: https://video.ploud.fr/videos/watch/e2c81d4f-4e11-434f-9dc6-d008db9e0fae

     

    Update :

    Here is a new block after updating the buffer sensor with one of the remaining sensors for switching to the 2S Palette.

    After a factory reset, a new calibration of the Palette (Old SPC 2.44 New SPC 2.45 / Old PPM 38.05 New PPM 38.24) and a first impression of calibration with the Keychain in 2 colors last version which worked well.
    A second impression again generated a blocking of the Buffer with Error 121 (see video link below).
    The impression could be finished by having pulled a little on the filament to restart the progression. There was no more blockage until the end

    I specify that the speed is 30mm / s, that the Firmwire of the Palette is the last available and that the Octoprint Plugin is also up to date.
    The files are generated with Canvas.

    It seems obvious that there is a bug and that this prevents normal use of the Palette.

    Do you have a solution please?

    Example 3: https://video.ploud.fr/videos/watch/ada1cd2d-b2f3-4a39-bcde-da1b954a2aa3

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    Jonny Yeu

    Hi Picaboubx, thanks for sharing this information, I'm glad to hear that you were able to solve the overloaded issue. I will speak with our firmware team about the Error 121 that you're now receiving as your print speed is definitely reasonable, and based on the video your switch is not responding the way it is designed to be. Once I have additional information, I'll respond on this thread. 

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    Picaboubx

    thank you I await your return.

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    Jonny Yeu

    Hey Picaboubx, could you please check two things for us:

    • On Palette's screen, please go to Settings > About > Next. On this screen, you should see an Encoder field. Does the number next to this field change at all? If so, by how much?
    • While on this same screen, please remove the acrylic cover that sits over the encoder. Please rotate the encoder one full rotation. How much does the Encoder value change?
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    Picaboubx

    Good evening,

    I am not sure I understood your request (Google translation).
    So I made you 2 short videos:

    - Settings> About> Next: https://video.ploud.fr/videos/watch/4f0f97de-de46-457d-a4a3-50b899ed66a7

    - rotate the encoder one full rotation: https://video.ploud.fr/videos/watch/0d24414b-b714-44ac-a5f9-c4345cee466d

    I hope this will meet your request.

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    Jonny Yeu

    Yes, those videos are perfect. Your Palette is performing as expected, so we'd like to isolate Palette to see if this is the cause of the problem. Could you please detach your Palette from your printer then run Multi-Spool mode With Printer. Once Palette has created enough filament to exit the outgoing tube, please share a video of your Palette's buffer as you pull filament out of your unit.

    Thanks for your patience with this. If we're unable to solve the issue after this, we can bring your unit back to our offices in order to repair you Palette.

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    Picaboubx

    Here is a video of the procedure which I hope to have carried out correctly

    Video: https://video.ploud.fr/videos/watch/f6bd122e-967f-431a-8eb5-34b8d7f4b227

    (If the video is a little long to start is that it is still in encoding on the server and should be available soon in High Definition)

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    Jonny Yeu

    Thanks for sharing. Everything looks fine in multi-spool mode, so could you please try and run another normal print and see if the issue appears again?

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    Picaboubx

    I just tried a new impression which failed because of a splice failed always on the same reel but randomly.
    it works at first then it crashes, then it works again on the next impression.
    I will try again tomorrow by changing this filament to another.
    Perhaps there is a problem with this filament.

    video extract for info: https://video.ploud.fr/videos/watch/b8b001d2-101a-444a-b5b4-a7a6ea9000b3

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    Picaboubx

    Hello,

    Always a problem with the filament input number 3 of the pallet which seems not to be working properly.

    Here is the demonstration in 2 videos:

    (Note: at the time of this post, the videos below may not be fully encoded and may be a bit slow)

    Video 1: 1st print for start of 4-color calibration test. The Splice of the black filament (entry 3) is done 1 time but is not done the 2nd time
    https://video.ploud.fr/videos/watch/d7a93937-524f-4a5e-8b58-ee038b32b6e2

    Video 2: Inversion of the black filament (input 4) and the yellow filament (input 3). Another assembly problem with the filament coming from input 3.
    https://video.ploud.fr/videos/watch/6b2c1d72-fb89-46de-96bf-c465ead38b3d

    So after thinking that maybe it came from my gray filament, from a too big and too heavy spool or from a compression problem (currently set to +3) I think this test proves that it comes from the input 3 itself and apparently a problem feeding the filament.

    Do you have an idea about this problem?

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    Jonny Yeu

    Thanks for the videos, Picaboubx. Could you please try and increase all three of your Heating/Compression/Cooling by a factor of 3 and see if this changes your splice quality? 

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