layer shifting ... different from the others

[memberno99 0]

hi to all,

I have this problem with the ultimake 3 extended printer.

during printing there was a layer shifting to the left

the printer keep printing many layers with the same shifting

after a while, the printer had a shift again, but to the right and then keep printing with the same shift

as seen from the photo, i have 3 different alignment.

I had to stop 2 days of printing

 

what's the problem...any ideas?

 

p.s. i already check that my pulleys are secured

 

[DF-Werkzeugservice 8]

Hi, 

for me this looks like the X Motor is skipping steps at some point.

Are you using Cura as slicer and single extrusion?

 

I've experienced skipped steps so far by the following reasons:

 

- overtravelling print boundaries when using another slicer than cura

- collisions with the print itself, caused by warping

- sticking print head cable / bowden tube when using 3rd party enclosures

- sometimes when using the assisted filament change during the print (can't remember the Firmware version)

 

If none of the above reasons is possible for you, I'd try reducing travel speed and acceleration.

Especially with pretty high prints like that one I've recognized some "micro collisions" between the print core and the previous layer. The faster the print core is moving, the more likely it is for it to loose steps - at least that's my experience.

 

 

[fbrc8-erin 191]

Have you lubricated your rods recently? How does it feel if you move the printhead by hand?

[Dim3nsioneer 464]

If it is only left-right you also might want to check if the print table glass is moving. If it does, squeeze the back clips together so they hold the glass tightly.

[memberno99 0]

23 hours ago, DF-Werkzeugservice said:

Hi, 

for me this looks like the X Motor is skipping steps at some point.

Are you using Cura as slicer and single extrusion?

 

I've experienced skipped steps so far by the following reasons:

 

- overtravelling print boundaries when using another slicer than cura

- collisions with the print itself, caused by warping

- sticking print head cable / bowden tube when using 3rd party enclosures

- sometimes when using the assisted filament change during the print (can't remember the Firmware version)

 

If none of the above reasons is possible for you, I'd try reducing travel speed and acceleration.

Especially with pretty high prints like that one I've recognized some "micro collisions" between the print core and the previous layer. The faster the print core is moving, the more likely it is for it to loose steps - at least that's my experience. 

 

 

 

Hi, thanks for the answer

 

right now i'm using Cura, last version for software and printer's firmware

material il PLA original ultimaker and i didn't change it during print.

i print at 60% of full speed ( I changed the speed from the printer and not from the advanced options in the software Cura)

 

when you say "I've recognized some "micro collisions" between the print core and the previous layer" ... what do you mean, or better, where do you see them?

 

p.s. the printer is new ... it's the third time i use the printer , i didn't lubricate but the movement is fluid.

p.p.s. nice idea, i didn't check before ... but the print plan is still

Edited July 4, 2018 by memberno99

[DF-Werkzeugservice 8]

Actually you can't really see the "micro collisions". But you can hear them, especially when the print head is travelling over Infill oder Support. It's a slight rattering, like when you go with your finger over a comb or something like that... 

But they happen usually more on ABS than on PLA due to the warping.

 

Does the shift happen always at the same height each print?

[memberno99 0]

On 7/4/2018 at 4:08 PM, DF-Werkzeugservice said:

Actually you can't really see the "micro collisions". But you can hear them, especially when the print head is travelling over Infill oder Support. It's a slight rattering, like when you go with your finger over a comb or something like that... 

But they happen usually more on ABS than on PLA due to the warping.

 

Does the shift happen always at the same height each print?

 

no, the height is random

 

i keep trying a bit more, now i noticed that the shift in only to the right, i got a left shift only once (picture)

i also noticed that the shifts are more frequent at high speed.

 

 

 

 

 

[DF-Werkzeugservice 8]

Do you have the z-Hop enabled?

[memberno99 0]

4 hours ago, DF-Werkzeugservice said:

Do you have the z-Hop enabled?

 

i don't know.....i'm going to check

 

btw, are there any other settings to consider?

Edited July 6, 2018 by memberno99

[DF-Werkzeugservice 8]

Well despite you already did that, i'd recheck the pulleys, Belt Tension and if the Motor is tight mounted.

You could also Move the print head fast by hand and Check if the pulleys and belts are following the movements.

[memberno99 0]

3 hours ago, DF-Werkzeugservice said:

Well despite you already did that, i'd recheck the pulleys, Belt Tension and if the Motor is tight mounted.

You could also Move the print head fast by hand and Check if the pulleys and belts are following the movements.

 

I checked everything you said and everything seems OK to me

 

z-Hop is a Cura software settings? there are any other Cura software settings to check which can be connected to the layer shifting problematic?

[DF-Werkzeugservice 8]

the z-Hop is a cura Setting. Thus means the print bed gets lowered a little before each travel move, which prevents the nozzle from hitting the printed Part.

You're sure the glass plate ja conpletely fixed by the clamps?

[memberno99 0]

20 hours ago, DF-Werkzeugservice said:

the z-Hop is a cura Setting. Thus means the print bed gets lowered a little before each travel move, which prevents the nozzle from hitting the printed Part.

You're sure the glass plate ja conpletely fixed by the clamps?

 

the plate is fixed

 

in cura software, are there any other options that can be related to the layer shifting problem?

[DF-Werkzeugservice 8]

Layer shifting is always a mechanical issue... I don't have an idea of any other settings than the already mentioned ones in cura have something to do with it.

You could switch the X and Y stepper to take a look if it's an issue with the stepper itself.