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Cura 4.1 alert

Discussion in 'Software' started by tkoco, Jun 20, 2019.

  1. tkoco

    tkoco Active Member

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    I updated Cura 4.0 to 4.1 version. I found that with the same printer profiles, material profiles, and other settings, the print time for models tripled from what it would have taken using version 4.0.

    For myself, I have gone back to version 4.0 and will not consider an upgrade until another version comes out.
     
  2. albert3d

    albert3d Member

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    estimated print times or the actual print times tripled?
     
  3. tkoco

    tkoco Active Member

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    Actual print times. The estimated times have always been under-stated. Example: Cura might state (at the start of a print) 16 hours to print and take 20 hours to print.
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    All slicers will underestimate print times. It is physics :) To get more accurate times requires calculus and even then it would be a running "estimate"

    "Speed is the distance an object travels in a given time. We measure speed by its magnitude, or its numerical value. ... Velocity is related to speed because velocity is a measure of speed, plus a measure of distance. Finally, acceleration is also related to velocity because it measures the change in velocity over time."

    Velocity is the first derivative of speed WRT time
    Acceleration is the second derivative.
    (edit: jerk is the 3rd derivative - measures the change in acceleration over time)

    The math, gets hard.

    Every time the print head changes direction or speed and/or acceleration is involved (and velocity -- let'd not for get that one either). Calculating all of that calculus is similar in effect to why rocket science is complicated ;) All of the slicers/host programs use a estimator. Usually a running estimator.
     
    #4 mark tomlinson, Jun 20, 2019
    Last edited: Jun 21, 2019
  5. tkoco

    tkoco Active Member

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    Agreed. And the estimate gets more accurate as the print progresses.
     
  6. Susanne Adam

    Susanne Adam New Member

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    Very True.
     

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