Z Calibration: Can't get nozzle to touch glass plate

Discussion in 'Calibration, Help, and Troubleshooting' started by srd, Apr 2, 2016.

  1. srd

    srd Member

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    So I'm in the final stages of assembling my Pro. I'm currently stuck on the z-axis calibration step.

    After choosing "Move Axis" -> "0.1mm" -> "Move Z" and turning the knob so that the bed moves all the way up, there is still a 5-6 mm gap between the nozzle and the glas bed. I'm stumped.

    Looking under the print bed, I can see that the lead screws still have a few mm left, that would theoretically allow further upward movement...

    Did I install some mechanical part upside down, that's causing the gap? Or is the firmware just refusing to go those last few mm for some reason?

    Any help appreciated!
     
  2. R Design

    R Design Well-Known Member

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    How far above the glass bed (and/or above the nozzle) is the IR sensor?

    Did you remember to first set Z-offset to -5mm ?
     
  3. srd

    srd Member

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    The IR Sensor was positioned as the build manual wiki stated.

    The solution was setting the z-offset to -10mm, I had a correction of 1.07mm after doing the subsequent fine calibration.
     
  4. Rob Heinzonly

    Rob Heinzonly Well-Known Member

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    If I recall correctly, you have to move the bed manually (by turning the lead screws). I do remember a youtube video of Livi and Greg where this was the case.
     
  5. srd

    srd Member

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    According to the build manual, this is part of the z calibration for the dual, not for the lite/pro though. The solution via larger z-offset is fine by me though - less opportunity to manually scew up the previously nicely leveled print bed :)
     

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