Stratasys Objet350 poor print location

Hi everyone,

 

My printer has taken to printing the first 5 or 6mm of print perfectly, then deciding to print wherever it feels like.  Sometimes it seems like the print is just offset in the Y axis as you can see a diffuse model being formed as if it's just printing in the wrong place.  Sometimes it just prints wherever it feels like.

I've seen the printer printing outside its build volume (in a border 20mm around the supposed maximum build surface of the printer) occasionally but it's got to the point where it's refusing to do anything higher than a few mm without losing it's positioning.

 

I've performed the encoder test which checks out and it seems happy with but this only tests the X Axis rather than all axes.  I've checked belt tensions and have never heard the motors stall or noticed any belt slip.  

 

Before I have the case off does anyone know whether the Y Axis is encoded?

 

I've considered options such as step loss but it seems to be a jump to a position rather than a gradual position drift.  I've checked for model impacts (previously an issue with a badly positioned roller) but everything looks (and sounds) like it did new.  

 

I assume also that there's an initiation and synchronisation between the heads firing and step position so wondered if this could be a problem.

 

The Printer has preventative maintenance performed on a weekly basis and struggling to see where it might be going wrong.

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I'm only ever using the Objet software (both slicer and print software) which won't let you print outside the constraints of the bed plate.

 

From what I can gather the only way this will happen is if the head isn't where the printer thinks it should be. I'm having a look at the motor driver assemblies and checking that I'm not loosing position because of anything silly.  After thinking back and checking preventative maintenance logs, this had occurred in the past but went away of its own accord.

 

I'm sure I'll get to the bottom of it and when I do I'll report back.

 

I'm itching to stick a couple of triphasic drivers in and knock down to 80mm contrarotating cooling fans to try to lower the noise level while I'm on.

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Seems like what you have tried to debug it is a logical step. Is this the first time that this was happening or did it happen before? I'd look into 2 aspects of this issue: the model hoping that it doesn't go beyond the boundaries or the firmware. If you are using a different slicing system that is off from what Stratasys recommends the code to move at a certain point and jet the material could change where you are seeing jetting the material outside the boundaries.

Hope this is helpful.

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