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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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    Hello all!

    I designed a fairly basic object in 1223d design and it is essentially a 90mm tall block. when I print the exported stl file it is one 80mm tall. I am printing PLA. What could be the isse?

    Thanks!
     
    #1 CEchols, Jan 22, 2015
  2. Mike Kelly

    Mike Kelly Volunteer

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    In your eeprom settings what's your Z Steps per mm? Do you have a bottom cover?
     
    #2 Mike Kelly, Jan 22, 2015
  3. CEchols

    CEchols Member

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    Z mm per step is 2267.72

    I am not sure what you mean by bottom cover, but if you are referring to the 3d model no it is one solid piece.

    Thanks!
     
    #3 CEchols, Jan 22, 2015
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    The printer. Does it have a cover on the bottom?
    Sadly there are no model numbers on the printers so you have to know what to ask to figure these things out.
     
    #4 mark tomlinson, Jan 22, 2015
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    You see there are at least this many models:
    1) The beta
    2) the R1 with SAE rods
    3) the R1 with Metric rods
     
    #5 mark tomlinson, Jan 22, 2015
  6. Mike Kelly

    Mike Kelly Volunteer

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    Try 2560 for Z steps per mm
     
    #6 Mike Kelly, Jan 22, 2015
  7. CEchols

    CEchols Member

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    Ok I will try it out. My printer does have a bottom cover :)
     
    #7 CEchols, Jan 22, 2015
  8. Ziggy

    Ziggy Moderator
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    Then you will have 8mm metric threaded rods with a 1.25mm pitch.

    Z steps per mm should definitely be set to 2560 in configuration.h
     
    #8 Ziggy, Jan 22, 2015
  9. CEchols

    CEchols Member

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    Yeah setting the z mm per step to 2560 results in the extruder being to far off the print bed when starting the print.
     
    #9 CEchols, Jan 23, 2015
  10. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Adjust your starting Z offset?
     
    #10 mark tomlinson, Jan 23, 2015
  11. CEchols

    CEchols Member

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    Any ideas on a value? How would I heck the kind of z axis rod I have to know if that is the issue?
     
    #11 CEchols, Jan 23, 2015
  12. Mike Kelly

    Mike Kelly Volunteer

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    Z steps per mm would have little to no affect on Z offset. You need to try different settings and make sure the autoleveling is getting reliable/gunk free results.

    Measuring 1 inch of threads is easiest. If it's 18 they're 5/16". (1.411mm per thread). M8 would be more than that (1.25mm per thread)
     
    #12 Mike Kelly, Jan 23, 2015
  13. CEchols

    CEchols Member

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    I count 22 threads in one inch. I counted twice so I am fairly confident in that number, but I am pretty sure it is more than 18.
     
    #13 CEchols, Jan 23, 2015
  14. Mike Kelly

    Mike Kelly Volunteer

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    Then you have M8 like I said. Use 2560 and adjust your Z offset
     
    #14 Mike Kelly, Jan 23, 2015
  15. CEchols

    CEchols Member

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    Ok I am trying again. I am printing the calibration - bridge cube that comes with the printer software. Should take about 30 minutes :) ill let you know how it goes!
     
    #15 CEchols, Jan 23, 2015
  16. CEchols

    CEchols Member

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    I think that fixed it. I need to print something I know how tall it should be, but the bridge calibration cube looks a lot better after the changes.
     
    #16 CEchols, Jan 23, 2015
  17. CEchols

    CEchols Member

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    Well now it appears I have a related issue... the z mm pre step keeps resetting to 2267.72. Any idea why it would do that?
     
    #17 CEchols, Jan 23, 2015
  18. Mike Kelly

    Mike Kelly Volunteer

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    #18 Mike Kelly, Jan 23, 2015
  19. CEchols

    CEchols Member

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    Matter Control says I am using ROBO3dR1V2 (Up to data) Where do I get the version you are referring to?
     
    #19 CEchols, Jan 23, 2015
  20. Mike Kelly

    Mike Kelly Volunteer

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    in the link I posted
     
    #20 Mike Kelly, Jan 23, 2015
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