X Shift only on Dual Prints

[esancakt 0]

Hopefully someone can give some advice. i have the dual upgrade on my original. doing single prints seems to be fine, however on dual prints there are random shifts to the right during printing. this does not seem to be effected by choosing the wipe and prime or ooze shield (or neither). the shifting seems to be somewhat on the same level as when filaments change but not always.

Thanks!

 

[esancakt 0]

here is a video of what its doing. i think the ultimaker may think its hitting endstops but i'm not sure:

 

 

[Dim3nsioneer 558]

Have you watch it printing? On a dual extrusion print both hotends are heated which means the second hotend is also closer to the printbed/printing layer than in a single extrusion print due to the thermal expansion (it's about 0.1mm). Therefore it might get stuck on the print more easily and could lead to skipping of the x/y axes. Just a theory...

 

[esancakt 0]

That was my original thought, but now if you look at the youtube video i linked (hopefully i'm allowed haha). its doing it on a single print as well.

 

[Dim3nsioneer 558]

Sounds like a skipping motor...or moving axes/pulleys.

 

[esancakt 0]

all the belts and pulleys are tight. do you mean it could be the actual stepper? also i did change out the sintered bearings for linear bearings which made the movement tons better.

 

[esancakt 0]

in case anyone else runs into this, the solution to my problem was a bad stepper driver. i swapped X with Y and the shift moved to the other axis.