1 Topic by doppler (edited by doppler 2014-10-02 01:12:50)

  • doppler
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Topic: X Axis Drifts, but only under certain circumstances....

Ok, recently I installed my E3Dv5 (finally) and well it's awesome, soo much better than the stock extruder.  I've printed quite a few things, some big things, (raspberry Pi cases), and so far it seems when I print one thing at a time, everything is good.

However, when I print multiple objects, things go bad, at what seems to be the exact same place for each print, the X axis shifts, see 2014-09-28 18.55.51.jpg for a slipped print.  I don't hear any of the usual nasty noises from the printer when this happens so I do not think it's a head jam/belt slip. (Actually I lied here, there is a return to Home as described below every 5 layers, evidently not good enough).

And to add to the mystery, I added to my gcode after each layer change G28 XY, so home the X and Y axis, well with that, it prints fine, see 2014-09-28 18.56.41.jpg, the only difference is the slicer adds G28 XY for at each layer change.

I just don't get why sending the xy back to home every layer prevents the problem.  It can't be overheated stepper chips or motors, or a jam, if it was a jam there'd still be one layer out of sorts at least once in a while.  Is it software, is there known bugs, overflows or something in the printing software?

Any ideas very much appreciated... I'm going crazy, and homing the carriage every layer is slowing me down, and driving me bonkers.

Thanks
  Andrew

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2 Reply by doppler

  • doppler
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Re: X Axis Drifts, but only under certain circumstances....

Well I ended up working it out for myself and in case anyone else has the same issue you can give the fix I did a try.  I had an ah-ha moment today, remembering back in time when my Y axis did something similar, I had to adjust the stepper drivers reference voltage.  So today I just upped the X a little bit, didn't even measure it, just gave it a little bit clockwise turn.  Ran the problematic job... no problems, no need to send xy home every layer.  Odd how the problem exhibited itself, but I'm glad it's resolved now.

Andrew

3 Reply by wardjr

  • wardjr
  • wardjr
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Re: X Axis Drifts, but only under certain circumstances....

I am glad to hear that you worked it out.  Perhaps you may find this link usefull with future troubles.
http://www.soliwiki.com/Motor_skipping_steps
wink

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