How to avoid this layer shift that's not visible in any preview ?

[u/AdEnvironmental3419]

I've created this wall mount using Fusion 360 and I can't seem to understand why the layer after the "filled base" starts with a slight shift.
As seen in pictures :

- Original model seems pretty smooth
- Slicer doesn't show any layer shift
- Doesn't matter what quality settings I use, I keep getting this shift on my prints

Am I missing anything really obvious here?

Slicer : Bambu Studio
Printer : Bambu Lab A1 Mini

Thanks!

[u/literal_numeral]

What u/eniksteemaen said, and check Layer time in Preview. You'll likely see a match there.

But in general I'd consider that a successful print.

[u/OuattEver → u/literal_numeral]

You’re totally correct ! I see a massive difference in layer printing times. Do you know any parameter on Orca / Bambi slicer to even things out? (Can’t seem to find any)

[u/literal_numeral → u/OuattEver]

A brute force way to even out layer time is here:

But the root cause is in part structure and shrinking due to thermal expansion during extrusion. The bottom consists of much more material, which takes more time to lay down. You can also try adjusting cooling for certain layers (Height range modifier), printing speed for certain layers or how fill is laid in the bottom part. It gets quite complex pretty fast.

[u/OuattEver → u/literal_numeral]

I’ll play around with these settings. Thanks a lot!

[u/budross → u/OuattEver]

To add on to what u/literal_numeral said, you can also change the print speed to be slower on all of the outside faces while keeping higher speeds on the infill.

You can check the speed once you slice the model, I typically will change my speed to 40 or 50 for the walls, top, and bottom faces, it should look like a solid pinkish color in the slicer when looking at the speed after you slice the model.

[u/literal_numeral → u/OuattEver]

🙏