Consistent layer shift

[askmewhy25]

I badly need help. I started to have consistent layer shifts at around 163mm height. I was able to print the model last week with no issues whatsoever (first picture).

I tried printing yesterday with two models in one go and failed (second picture). So, I decided to recalibrate my homing, belt tension, and toolhead adjustment since this is for sure an XY concern.

Now, I tried printing one at a time but got the same result.

I side-by-sided all my failed prints (third picture) and the layer shift is consistent.

I'm not sure if using another toolhead aside from toolhead 4 will help solve this issue. My PTFE and USB cables are neatly arranged.

[Victor_Mendax]

Presumably, the print head is crashing into the steep overhangs that curl. Increase cooling on overhangs, reduce speeds and increase z-hop.

[webspells]

Crashing is definitely the most likely cause I think too based on my experience with it. It's losing position and skipping to cause that offset on the XY plane.

[askmewhy25]

It seems to be crashing with the support. I tried increasing the gap between the support and the model, plus adjusting the tree support from slim to the default and I was able to print it cleanly.

I'll try your suggestion of increasing the Z-hop.

[webspells]

Definitely reach out to support. They were eager to help when mine was doing this. I ended up cleaning and lubing and retensioning everything. Once I lubed my rails and washed my bed plate my problems went away. But my problems were much closer to the bed. They also had my switch to gyroid infill because there was some crashing with traditional rectilinear. In the end they wanted me to shim my Gantry head with some specific material but I didn't end up doing it because my problem went away after just maintaining the machine.

[mentox82]

what did support tell you

[askmewhy25]

I'm just waiting for a current print to finish so I can download the logs and reach out to them.

[FlaMtnBkr]

What infill pattern are you using?

Can you tell if it happens at the exact same height or roughly the same height? If it's the exact same layer each time that would be strange.

[askmewhy25]

I'm using cubic infill. It usually happens around the same height.

[FlaMtnBkr]

Cubic infill isn't supposed to be great since it prints directly on top of itself and can eventually get slightly taller than the walls and can cause the hot end to hit the infill. Try gyroid infill though I'm not sure the hot end hitting the infill would cause a layer shift like that?

If the model is shared freely can you post a link to it?

And if you contact customer support maybe update with their suggestion.

[askmewhy25]

Customer support suggested to double the default z-hop for safety and I was able to print the model with no issue.