Prints drifting right to left?  

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Enceladus42
(@enceladus42)
Active Member

Hi all

Finished building my mk3s friday!

Benchy printed fine in pla, but trying to print PETG (default settings in prusa slicer) and the print slowly "drifts" from right to left.

Was all over the place right to left, so tightened the cross belt and has made it much better, but keen to eliminate the drift.

any help would be much appreciated.

thanks

chris

Best Answer by Neophyl:

That's a weird one that I've not seen before.  Layer shifts that produce uneven walls etc yes from loose pulleys but a gradual shift over that then stops is different.

The only thing I can think of at the moment is to check your cable bundle isnt too tight at that height (its stiff so can act like a spring).  This could possibly be making your x axis motor lose steps.  

btw when someone asks for the model they usually mean the actual stl model.  Although for debugging purposes its MUCH better so go File>Save Project As.  Then ZIP the resulting .3mf file up and then attach the zip file.  It has to be zipped or the forum wont accept it, as only certain limited file types are allowed.  And .3mf as the project file contains the model AND all of your settings.  That allows someone to slice it and preview it with exactly the same environment you are using.  

Posted : 05/07/2020 2:51 pm
peter.m26
(@peter-m26)
Honorable Member

Pictures of model and first layer please?

Posted : 05/07/2020 5:50 pm
Enceladus42
(@enceladus42)
Active Member

apologies for the delay in getting back to this. work gets in the way 🙁

this is the design in f360

and this is how it starts printing

any help would be appreciated.

Posted : 07/07/2020 8:19 pm
Enceladus42
(@enceladus42)
Active Member

update: the prints drift right to left for the first 5mm or so, then print as expected. very confused!

Posted : 07/07/2020 10:03 pm
Neophyl
(@neophyl)
Noble Member

That's a weird one that I've not seen before.  Layer shifts that produce uneven walls etc yes from loose pulleys but a gradual shift over that then stops is different.

The only thing I can think of at the moment is to check your cable bundle isnt too tight at that height (its stiff so can act like a spring).  This could possibly be making your x axis motor lose steps.  

btw when someone asks for the model they usually mean the actual stl model.  Although for debugging purposes its MUCH better so go File>Save Project As.  Then ZIP the resulting .3mf file up and then attach the zip file.  It has to be zipped or the forum wont accept it, as only certain limited file types are allowed.  And .3mf as the project file contains the model AND all of your settings.  That allows someone to slice it and preview it with exactly the same environment you are using.  

Posted : 08/07/2020 7:15 am
kevin.k49
(@kevin-k49)
Eminent Member

Also - check the grub screws on the extruder for the X axis.  If they get slightly loose and there is any friction points (and there always are some) on the axis it will shift the layer going across that friction.  If the screws are marginally tight it may be that the extra friction is only enough when at low heights due to things like the cable bundle.  Easy to forget those grub screws can loosen and will cause issues.

Posted : 08/07/2020 5:36 pm
Enceladus42
(@enceladus42)
Active Member

thanks @neophyl

got the drift down to the first 2mm or so by playing with the cable bundle, so i'm guessing this is the issue.

will keep playing with it and see how it goes.

Posted : 10/07/2020 1:15 pm
Neophyl
(@neophyl)
Noble Member

If you can loosen the wrap off somewhat, untwist it.  IIRC that makes it less stiff, but I'm glad you at least have an avenue to go down.

Posted : 10/07/2020 1:49 pm
Enceladus42
(@enceladus42)
Active Member

i "think" i might have fixed it.

released the screws holding the cable bundle into the control box, unwound it a bit and ran the Z through its full range.

Tightened back up and did a test print.

Seems to be working ok.

Posted : 10/07/2020 5:08 pm
Enceladus42
(@enceladus42)
Active Member

just had another thought...

prints are fine from the sd card, but i've been printing using API to octoprint from prusa slicer...

will try saving the files to the raspberry pi and printing from there to see if there is any change.

work tomorrow (sat) so will probably have to wait until sunday.

Posted : 10/07/2020 8:13 pm
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