Major shifts in Y axis - why?

Discussion in 'Calibration, Help, and Troubleshooting' started by richgain, Oct 9, 2016.

  1. richgain

    richgain Well-Known Member

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    I decided to try Emmett Lalish's tricky Pre-assembled Spherical Iris box ("not for the faint-hearted and needs a well-tuned printer") on both my trusty old Mendel90 and my new E3D BigBox. Taking it slowly, it's a 10-11 hour print at 0.15 mm resolution, so I left it running overnight.
    The Mendel90 did well although a little over-extruded, meaning I haven't been able to get the mechanism to work yet.

    [​IMG]

    The BigBox however, presented me with this mess.

    [​IMG]

    [​IMG]

    [​IMG]

    No signs of over-extrusion - I think the mechanism would have stood a much better chance of working on this copy - so no real clues as to why there should have been such a sudden and dramatic shift in the Y direction.
    This is becoming an all too frequent occurrence lately, and I believe the shift is usually parallel to the Y axis.

    Anybody care to suggest what may be causing this?
     
  2. Jasons_BigBox

    Jasons_BigBox Well-Known Member

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    First thing to confirm, is the print still attached to the bed?

    Some have found that they have steppers missing moves, myself included. For me it was on the z-axis.

    Check and double check your stepper driver voltages.

    Check your belts are tight and that your pulleys are not slipping.
     
  3. richgain

    richgain Well-Known Member

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    Thanks, Jason.
    Print is firmly attached until the bed cools, then it releases completely. Print Bite is far and away the best surface I have ever used! I now have it on both printers.
    Stepper drivers just rechecked - all five are still reading 0.56 V.
    Belts are tight and pulleys are rock solid.
     

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