Ghosting or Layer Gaps

[BarbaRossa]

Hello everyone,

I’ve been experimenting with printing a lampshade using Silk PLA and have completed around 15 prints with various settings, but I keep encountering the same issue: small gaps in the outer wall, as shown in the screenshot below:

Here’s how the lampshade looks when printed and illuminated:

I’ve tried printing on both the P1S and P1P, equipped with a 0.4mm hotend, and the results are identical. The lampshade has a wall thickness of 2mm (which can be adjusted if needed), and my standard settings include:

• 3 wall loops (printed outer wall first)
• 1 layer of infill

I’ve tested different layer heights (0.16–0.22mm) and widths (0.25-0.35 - larger layer width shows also clear errors in slicer!), speeds, and even adjusted infill/wall overlap, but nothing seems to solve the problem. I also tried to adapt the line width of outer/inner wall and infill to roughly match the 2mm wall thickness. Regardless of what I do, I always have this yellow simmer (inner wall) through the outer wall orange in the bambu slicer, which leads to the results shown above.

If anyone has encountered similar issues or has suggestions for resolving this, I would be incredibly grateful for your advice or insights. Thank you in advance for your help!

[BarbaRossa]

Here is what the lampshade looks.

[Lenyo]

Are you using classic wall generation? Did you try arachne?

Based on the prepare view (I can see the triangles that make up the model) I am wondering how you exported this? I am assuming it is your design.

I’m still on Bambu Studio 9.1.7.52 so it doesn’t have the new style STEP import, but I export STEP from fusion and then get the best quality imports in Bambu Studio. Like I said in 1.10 newer version they changed this to give you control over the quality of import, so perhaps that is part of the issue.

[BarbaRossa]

Lenyo, thank you very much for your suggestions!
On the slicer Arachne looks much better! But I will export these files from Rhino as .step files as well, this sounds promising!

Thank you for your time!

[BarbaRossa]

I made an step file import to bambu slicer, unfortunatelly these layer gaps with simmering internal walls are still there:

Arachne is similar, but it takes almost twice as long.

For Arachne I was not able to make a gap infill, which would result in a faster printing, due to eliminating travel time for internal solid infill.

In the classic mode I can change the layer height to 0,19 and the gaps get smaller, in connection with a reduced speed this will lead to a good result, but again the printing time is pretty high.