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PLA Stringing/blobbing


ianeagland
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Posted · PLA Stringing/blobbing

Hi

I am into my 3rd month of using an Ultimaker with ulticontroller for part production using PLA. I use Cura to great effect and on what I would describe as basic solid parts where the extruder remains with in the body of the object the results are excellent. However recently I have made a number of parts with projecting features (think of a table upside down on the bed with legs in the air). The issue is a lot of stringing and blobs where the extruder stops to move in air across to the next feature. Any suggestions as to the best strategy/settings to reduce this blobbing and stringing? The parts are perfectly usable and clean up with a knife but that is time consuming and I would like if possible to replicate the really clean finish I have achieved on other more basic parts.

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    Posted · PLA Stringing/blobbing

    You might be happy to know that I set 4.5mm retraction as a default for the next release. And added a retraction on/off checkbox so you no longer need to set it back to 0 if you don't want retraction in a print.

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    Posted · PLA Stringing/blobbing

    Daid:

    May i request another feature?

    can you inclunde "layer: current/top" in the printing dialog? pretty please

    :D

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    Posted · PLA Stringing/blobbing
    Daid:

    May i request another feature?

    can you inclunde "layer: current/top" in the printing dialog? pretty please

    :D

    How about a pretty accurate "printed for X time" and "X time remaining in print" values? And a "Printing at height Xmm" value?

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    Posted · PLA Stringing/blobbing

    oh. yes please.

    i have noticed that print time in cura differes from actual print time

    One said 3:36, 4:30 was correct

    Another one was 0:49, 1:20 was correct.

    it might be my setting but, ive highjacked this tread enough: look for another thread

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    Posted · PLA Stringing/blobbing

    No, it's a known problem. I actually had a talk with Erik about it today. And the problem is in the acceleration, the printing estimate doesn't account for acceleration. This can be solved, with quite some work, but it's not on the top of our priority list. (The Mac installer is)

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    Posted · PLA Stringing/blobbing

    If I set the retraction to 4.5mm - should I also set the Extra length to 4.5mm to re-prime the nozzle?

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    Posted · PLA Stringing/blobbing

    It is also a good idea to print with the lowest temperature possible for the filament you are printing with.

    This might take some tweaking to find the exact temperature because it may vary with different colours.

    Also slightly increasing speed might save you some stringing.

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    Posted · PLA Stringing/blobbing
    If I set the retraction to 4.5mm - should I also set the Extra length to 4.5mm to re-prime the nozzle?

    Nope, the "extra lenght" is extra, on top of the normal reversal.

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