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Z axis seems to be "compressed" after Marlin upgrade

Discussion in 'Mods and Upgrades' started by Kingbob, Apr 1, 2018.

  1. Kingbob

    Kingbob Active Member

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    I have an R1+ thats stock besides an E3D V5.
    Today i finally got around to upgrading the firmware from an ancient version to 1.1.7. Everything seems to be ok, except that the Z axis seems to be compressed.
    What i mean is, if I tell Mattercontrol to move the carriage up 10mm, it only moves 5mm.
    If i print a test piece that is 10mm tall, the result is 5mm tall instead.

    X and Y axes seem fine, just Z.

    Suggestions?
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Wrong Z steps were used in firmware. Which really means you used the incorrect firmware or if you used a generic version of Marlin you set the Z steps incorrectly.

    The R1+ has 800 steps on the Z if memory serves. :

    #define DEFAULT_AXIS_STEPS_PER_UNIT{80,80,800,723.38} //default steps per unit for RoBo3D R1+
     
  3. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    The Ancient version is fine unless you are going to be using a more recent version of ABL/UBL/Mesh leveling.
    Frankly, manual leveling is perfectly fine for 90% of the machines out there :) Since you did say you are using 1.1.7 then it is the generic version of Marlin so just check the line I referenced in CONFIGURATION.H for the correct values.
     
  4. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    You don't mention where you got the firmware from, the Community version here, direct from Marlin's GITHUB, or direct from Robo's GITHUB?
     
  5. Kingbob

    Kingbob Active Member

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    I used the Marlin version from here:
    http://community.robo3d.com/index.p...7-release-for-robo-r1-r1-plus-variants.18362/

    I thought i had an R1+, so downloaded that version of the firmware, which does use 800/steps/unit. But after checking my threaded rods with my verniers, they look to be a fraction under 8mm, which i believe makes them 5/16 rods. I've just uploaded the correct settings and am about to test.
     
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  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yep, test the threaded rods with nuts if you are not sure.
     
  7. Kingbob

    Kingbob Active Member

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    Yep that did it. Guess i have an R1 not an R1+ :(
     
  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Hey, now you know :)

    Handy if you want to make any mods later.
     
  9. Kingbob

    Kingbob Active Member

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    True, now just need to sort out constant jamming. 4 failed Boatys between 20-40 mins in. Filament jams then the hobbed bolt eats a chunk out, and have to get in with pliers to get the stuck piece out.
     
  10. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    PLA? Probably micro-clogs. Other filament type ... likely something else (like a Z offset too low).
     
  11. Kingbob

    Kingbob Active Member

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    Yeah PLA, but i suspect its the retraction settings. Have been increasing them to get cleaner prints, so i think its at a point where its trying to retract too much/too fast, and the hobbed bolt chews a chunk out of the filament and cant feed it anymore.
    Going to lower the retraction tonight and see if it helps. Running out of ideas on how to get better prints.
     

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