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simmonsstummer

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Posts posted by simmonsstummer

    Ultimaker 2 never fill well the tops

    in UltiMaker Cura

    Posted

    I had that curling issue once. Only once. It ended up being a partial blockage near the tip of the nozzle. I fixed it by taking a metal needle (I used a hypodermic needle but acupuncture needles work well also) and sticking it up into the nozzle hole from below and scriping around a bit to clean the surface. Took about 10 seconds. Be careful not to put holes in your isolator (don't stick the needle in very far).

     

    is there any chance to damage the nozzle scratching it with the needle?

     

    I should say that I havent tried 240C with PLA myself, I was coming up with theories because Simmon asked for some.

    I'm more curious on why Simmon is running it that hot with PLA. Given what we now know about the Teflon part, ISTM this is risking early deformation of the part, so I'm interested in why Simmon is doing it.

     

    Because i've seen this suggestion on the cylinder test topic:

    http://umforum.ultimaker.com/index.php?/topic/4586-can-your-um2-printer-achieve-10mm3s-test-it-here/

     

    Ultimaker 2 never fill well the tops

    in UltiMaker Cura

    Posted

    This saturday i meet the ultimaker team at the Maker Faire Rome and Chris give me some tricks how to perform the athomic method and other things. She was so kind to give me the new teflon isolator to test it.

    So i've changed it and yes my former isolator was damaged but no... i did not get any improvement in the test print.

    So i've done again the atomic method and as she said i pulled the filament just in the moment the nozzle reached 90°C but the results are the same..

    gallery_20815_489_695235.jpg

    A short video:

    https://www.dropbox.com/s/7tesnk422udh1vf/2014-10-04%2016.17.25.mp4?dl=0

    So i start noticing that my filament always come out the nozzle curly/crimped like the image below. Is it normal?

    gallery_20815_489_58087.jpg

    What else i can do?

     

    Ultimaker 2 never fill well the tops

    in UltiMaker Cura

    Posted

    last test:

    gallery_20815_489_219291.jpg

    gr5 i'll respond by point.

    1 - to try (maybe)

    2 - the bowden is clean and new

    3 - to try (and maybe deformed)

    4 - i'm pretty sure this is not the case

    My printer had so many troubles ( hot plate gone, power suppy gone, bowden tube gone ... and so many time clogged nozzle...) this year that i almost never use it. Like 4 days in 8 month. So i really can't accept a damage due to usage.

    I'm start thinking that somehow the nozzle is so dirt or ruined i need to replace it.

     

    Ultimaker 2 never fill well the tops

    in UltiMaker Cura

    Posted

    You need to do the atomic method at a colder temperature. It should be a perfect cone shape tip. Not like these.

    Note that you might need a new teflon isolator. These get deformed after many months of use. Ultimaker has newer ones that are built out of a better material now.

    Also is your role of red PLA getting near the end? The tighter radius of curvature on the spool of filament can also cause problems. Try printing the cylinder with your other PLA.

     

    I hope to find some teflon replacement @ Maker Faire Rome from Ultimaker stand! Is it something ultimaker provide to all the former printer or just by request?

    Today i'll try to wait more for the atomic method and see what happens.

    The red pla is almost at the beginning... but i noticed that is a little big even if shipped by ultimaker.

     

    Ultimaker 2 never fill well the tops

    in UltiMaker Cura

    Posted

    Ok with the DonMilne setting the printing has improved in quality.

    gallery_20815_489_252607.jpg

    gallery_20815_489_1164860.jpg

    I did twice the test cylinder (great idea) and is totally disappointing...

    @230°C

    I can see underextrusion almost since the beginning and then at the end of 5mm3/s the levels do not stick together.

    gallery_20815_489_712247.jpg

    gallery_20815_489_1079322.jpg

    Second attempt same settings (just to be sure)

    http://umforum.ultimaker.com/index.php?/gallery/image/9192-test-cylinder-second-attempt/

    I think i will try the atomic method as suggested to improve the cleanliness of the nozzle.

     

    Ultimaker 2 never fill well the tops

    in UltiMaker Cura

    Posted

    I would suggest establishing a baseline using say: T=220°C, speed=50, retraction enabled, 0.1mm layers, 0.8 or 1.2mm shell thickness, ditto for bottom/top layer thickness.

    I'm printing now with these settings. As soon as it finish i'll post a picture.

    The Um2 should handle 80mm/s for 0.2mm layers at least mine does (easily) maybe you should check if your nozzle is not partially blocked (look for atomic method).

    It's also good to print the test cylinder as suggested by Arjan

    What is the Atomic method?

    I downloaded the cylinder and i'll print it too soon.

     

    Ultimaker 2 never fill well the tops

    in UltiMaker Cura

    Posted

    All with retraction enabled and temperature of 232°C. The little object is been printed today with very high speed (something like 120mm/s just to try) And the bigger object at 80 mm/s.

    to summarize:

    Little Object. PLA 232°C - 0,1mm layer - 120mm/s speed - retraction enabled

    Big Object. PLA 232°C - 0,2mm layer - 80mm/s speed - retraction enabled

    Approximately same results.

     

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