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Unresolved Printed Object Different Height That 3d Model

Discussion in 'Troubleshooting' started by CEchols, Jan 22, 2015.

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  1. CEchols

    CEchols Member

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    No problem. So the channel running up to the circle i supposed to be 2.2 mm and it is actually 1.7 mm. The path around the circle is supposed to be 1.8 mm, but it is 1.5 mm.

    Also what is ribbing?
     

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    #41 CEchols, Jan 30, 2015
  2. Mike Kelly

    Mike Kelly Volunteer

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    Pictures from the side?

    Ribbing is a wavy pattern along the Z axis.
     
    #42 Mike Kelly, Jan 30, 2015
  3. CEchols

    CEchols Member

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    Here are some photos.


    20150130_151151.jpg 20150130_151130.jpg
     

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    #43 CEchols, Jan 30, 2015
  4. Mike Kelly

    Mike Kelly Volunteer

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    Hmm that looks nice. I'm thinking maybe it's over extrusion. Do you have any extrusion multiplier enabled?

    Try a calibration cube, see how close to spec it is
     
    #44 Mike Kelly, Jan 30, 2015
  5. CEchols

    CEchols Member

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    What are the specs on the cube? I am using Cura, and I do not see a setting for extrusion multiplier.
     
    #45 CEchols, Jan 30, 2015
  6. Mike Kelly

    Mike Kelly Volunteer

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    a 15mm calibration cube on thingiverse is fine. Just something you can know the dimensions of.

    Try this:
     
    #46 Mike Kelly, Jan 30, 2015
  7. Ben R

    Ben R Active Member

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    I had a problem with things not printing the right height. It was a couple of bad STLs that sliced way stupid...and maybe a slicer glitch. ran the STLs through netfab and deleted slic3r's config file and it worked. Just a thought.
     
    #47 Ben R, Jan 30, 2015
  8. CEchols

    CEchols Member

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    I printed a 20 mm calibration cube and the bottom (touching the heated print bed) of the cube is 20.13 mm and the top is 19.68 mm. That is a .45 mm difference!

    I am printing PLA with the extruder at 210 c and the bed at 65 c.

    What could be causing that kind of variation?
     
    #48 CEchols, Jan 31, 2015
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    A touch of under-extrusion might do it
     
    #49 mark tomlinson, Jan 31, 2015
  10. CEchols

    CEchols Member

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    So I may need to increase the steps per mm on the extruder?

    I did a filament length test (as best I could with what I had)

    I told it to extrude 10 mm and it actually extruded closer to 11.13 mm

    So that would be over extrusion. by 11.3% right? That seems like it would be an issue.
     
    #50 CEchols, Jan 31, 2015
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    It would be a small issue, but not the symptoms you have :)
    This would likely cause slightly fatter or thicker layers.

    That is probably true and more likely the solution to the problem you are seeing.
     
    #51 mark tomlinson, Jan 31, 2015
  12. Mike Kelly

    Mike Kelly Volunteer

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    I'm more concerned about the .13. That's not significant and could be measurement errors.

    For the height it could have to do with the first layer settings. Unless you get a PERFECT layer it could easily be off by a little.
     
    #52 Mike Kelly, Jan 31, 2015
  13. CEchols

    CEchols Member

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    The first layer on my prints does seem to protrude out past the rest of the print. I see the first layer settings in Matter Control, but not in Cura. Does anyone use Cura, or just know where it could be, or is this something I could do with G Code?
     
    #53 CEchols, Jan 31, 2015
  14. Mike Kelly

    Mike Kelly Volunteer

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    What's your Z offset set to?

    Advance > Quality > Initial Layer Thickness
     
    #54 Mike Kelly, Jan 31, 2015
  15. CEchols

    CEchols Member

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    0.0 mm So according to the info popup it would be the same as the other layers right?
     
    #55 CEchols, Jan 31, 2015
  16. Mike Kelly

    Mike Kelly Volunteer

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    Correct.

    Increase your Z offset probably.
     
    #56 Mike Kelly, Jan 31, 2015
  17. CEchols

    CEchols Member

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    Ok its in the start.gcode file right now set to -0.5. I should increase it?
     
    #57 CEchols, Jan 31, 2015
  18. Mike Kelly

    Mike Kelly Volunteer

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    Right. More negative = further from bed.
     
    #58 Mike Kelly, Jan 31, 2015
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