Calibrating Z Offset

Discussion in 'Calibration, Help, and Troubleshooting' started by clipper99, Mar 19, 2016.

  1. clipper99

    clipper99 Member

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    Hi,
    I'm totally new to 3D-Printing and the BigBox is my first 3D-Printer.
    Now I'm stuck at the point of calibrating the Z Offset. I've follow the instructions but everytime, I do the auto home after recalibrating the IR-Sensor, the buildplate don't stop going upwards.

    Could anyone please help me!? Btw i've got the BBPro Single.
    It's very frustrating after several failed calibrations...... :(

    thx
     
  2. R Design

    R Design Well-Known Member

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    Do you mean that, after doing auto-home, the build plate keeps going upwards and crashes into the nozzle?

    You did remember to set the height of the IR sensor with the rubber belt, when the nozzle was touching the glass?

    Are you sure that you did the maths right? It is very confusing.

    In the manual you start with a Z-offset of -5mm

    Then, after auto-home, you bring the bed up until it touches the nozzle.

    And if you had to raise the bed 3.4mm to touch the nozzle: your actual Z offset is -1.6 (-5 + 3.4)

    Which you must now enter - and then click"Store Memory".

    Then when you do the final auto home you can TEST the new Z offset my moving the bed up until Z = 0

    At which point the nozzle should just be touching the glass bed (as during calibration)
     
  3. clipper99

    clipper99 Member

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    I made the following steps:

    Loosen the IR-Sensor and move it down, so its slighly under the nozzle.

    Config Z-Offset to -5 mm.

    Doing Auto-Home.

    Loosen the IR-Sensor and move it all the way up.

    Moving the Z-Axis in 0.1 mm steps up, so it touches the bed.

    Laying the belt under the IR-Sensor, push the Sensor down to belt and fasten it.

    Config the Z-offset again: 2.2mm raising the bed to touch the nozzle = z-offset: -2.8.

    Doing Auto-Home again.

    --> Bed crashes into the nozzle...:mad:

    Is there anything I did wrong or forgot something???

    Thx, ralph.
     
  4. R Design

    R Design Well-Known Member

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    After you set the new z-offset "-2.8" you must navigate "up" one or two levels in the Control menu and select "Store Memory".

    NB "store memory" doesn't flash when you click on it, but it does do what it says!
     
  5. clipper99

    clipper99 Member

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    Oh, I forgot to mention this. I did store the memory.
     
  6. R Design

    R Design Well-Known Member

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    I'm puzzled.

    I've a Pro and that sequence works for me.
     
  7. K3LAG

    K3LAG Active Member

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    Is the LED on your sensor on all the time or only when the bed approaches it? If it's on all the time, you likely have the connector plugged in backwards. At least that was my experience.
     
  8. R Design

    R Design Well-Known Member

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    And your Z stepper driver is calibrated correctly? It's not at way too high a voltage?
     
  9. clipper99

    clipper99 Member

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    @K3LAG The Led is only in, when the bed approaches.

    @R Design I've calibrate them correctly yes.

    After a few more trial and errors, I figuered it out and calibrate it correctly. Don't ask me what the Problem was, I'm just happy that it works now.

    I've also did a Benchy testprint and all went well.

    THX guys for your help anyway ;)
     
  10. R Design

    R Design Well-Known Member

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    Congratulations.

    Welcome on board ;)
     
  11. Old_Tafr

    Old_Tafr Well-Known Member

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    Wasn't there a note somewhere in the instructions on tightening up the nozzles, the bit where you heat them to 285 oC to say there is a bug where the Z axis measurement goes back to zero?
     

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