Wobbly shape with spiral vase mode/tall print

Bambu Lab A1 Series Troubleshooting
1

I am printing this lampshade I designed in OnShape.

As you can see its sides are simple curves:

Screenshot 2024-11-14 at 4.28.29 PM
Screenshot 2024-11-14 at 4.28.29 PM1122×1196 63.8 KB

Which are maintained when sliced:

Screenshot 2024-11-14 at 4.29.20 PM
Screenshot 2024-11-14 at 4.29.20 PM1122×1196 70.8 KB

OrcaSlicer 3MF file:
Part Studio 1 - lampshade-2.3mf (6.8 MB)

But, when printing, I noticed as the print progressed, a bit after the half mark, that the curves started to become wobbly:

IMG_5317.HEIC
IMG_5317.HEIC2000×2667 1 MB

IMG_5318.HEIC
IMG_5318.HEIC2000×2667 745 KB

It’s still printing and it seems like the wobble has been resolved. I was around when the print was happening and the only possible thing is that at some point the filament got a bit tangled and started getting a bit of tension. Not sure if that tilted the printer out of alignment for a few minutes. Would that explain this weird hump?

2

Sorry I can’t help, but I like that unexpected “curvy” shape.

3

Haha yes it was a fortunate side effect. I’m now looking into how to do this kind of thing on purpose :slight_smile:

4

I would try a larger nozzle and line width

5

If the filament got tangled and upset the flow rate you might have some under extrusion but its hard to imagine this exact result.

To do this on purpose use ‘form’ modeling in fusion. Start with a cylinder and you’re just about done hehe…

6

Hey @orestis :wave:t2:

Were you able to solve this issue? In my case the wavy surface is even worse:

IMG_8525
IMG_85251920×2560 328 KB

IMG_8526
IMG_85261920×2560 376 KB

I printed this with Bambulab PETG translucent with a slow custom profile for 0.4mm nozzle:

  • in vase mode either with 0.42mm or 0.5mm wall size (the picture I attached)
  • in normal model with 1mm wall thickness (the waves are smoother but still there)

I assume it’s because of the temperature change between layers, but also there’s relation with the amount of material used and the speed.

I’m asking if you did some progress to solve this issue because I plan to try a super slow print

7

I printed another vase mode lamp shade, just a rounded shape though, and it came out perfectly. So I attributed the whole thing to just a slightly tilted printer that messed things up a bit.

In your case, the corners seem perfect so it might be something with the material properties, it might contract as it cools down a bit and since the corners are more rigid, it might warp…