This is my largest print so far and almost exactly half way through I got a substantial layer shift…
The part may still be functional, but I definitely want to know what might have caused this and how I can prevent it from happening again. Can anyone help?
Bambu White PETG
The pic looks like it probably came from an A1.
If you continually get it at the same Z height across many models - clean + regrease your z rods, z belt tension/replace, etc.
If you have a video of the print, look at that layer’s motions and see if the printer collided with the print and/or had an auto recovery incident (filament caught on spool, jerked around, parks, poops, retries automatically a few times). Collisions happen frequently from warping, if you check the flatness of the bottom of your print, is it curled up on any edge?
The pic with the dog logo shows the layer shift on the front 3 vert surfaces. The back surface has it too (mildly occluded but can be seen). How about that surface on the left?
Grid infill also exacerbates collision conditions, in case relevant. Use a noncrossing infill for tall prints.
Do you have a cat? Maybe kid(s)? Just a wild guess here…
Correct, its an A1 with AMS lite, unfortunately I don’t have a video to look at.
It otherwise looks to be a clean print, no warping that I can see.
Yes, the entire print shifted at that height, so it seems like something happened between one layer to the next?
Yes it is grid infill, thanks for that tip!
No cats, and my son is 5 months old, so not the issue there…!
Could this potentially be the culprit, or unlikely?
Or this?
Wispy bits of filament in the tracks could potentially interfere, but frankly i’ve never seen it happen and I’m guilty of letting that crud accumulate in the Y tray as well, lol.
That nozzle tip is a little gross but if its just plastic thats fine. (heat, brush away) Maybe for giggles do a flow RATE calibration test to make sure you’re not overextruding.
I dunno it looks like maybe a fluke.
I do tend to run bedslinger style printers slower for bigger prints, as insurance against a large number of kinematic issues. I wish the slicers had a more automatic way of specifying “full speed at the bottom, xyz speed at the top, blend as you move up” but that may not be relevant to your case.
So I just reprinted at 1/3 slower, 25% gyroid infill (i know thats high, but I wanted a bit more weight to this part anyways), and turned out fine this time. I’ll keep your suggestions in mind moving forward, thanks for taking the time to help explain things!
