Missing top surface under vertical wall - weak print #2009

New Issue

MrUnknownDE · 2026-04-05T22:30:36+02:00

MrUnknownDE commented

2026-04-05 22:30:36 +02:00

Originally created by @ro0ter on 10/3/2025

Is there an existing issue for this problem?

I have searched the existing issues

OrcaSlicer Version

2.3.1-beta

Operating System (OS)

Windows

OS Version

Windows 10 22H2

Additional system information

This is my first bug/issue report, hope I`m doing it right.
I have been looking through the issues for more than 1hr already and didn't find anything similar.. I remember some function that was strengthening the model under walls, but not sure in which software.. cura maybe? haven't used it in a lot time.

Photos for a better understanding:

Object:
Inner wall of the raising pipe (note you can see the infill between the vertical inner wall and the "top" surface inside the pipe):
Outer wall of the raising pipe (note you can also see the infill between the vertical outer wall and the "top" surafce outside the pipe):

The problem is that if I have a shape with a vertical wall starting from a surface, there will be absolutely no "top layer" printed under the respective wall, but only infill... that will obviously make the part much weaker and will not insulate the inside cavity from the outside world, allowing dust, water and debris to enter the inside of the printed object.

If Im not using some setting correctly, please do tell me.. Im really desperate in having my prints strong and not have sand / water enter the part...

Thank you!

Printer

Ender 3 S1

How to reproduce

open the attached stl
slice the attached stl
I use 3 walls, 4 top shells, 3 bottom shells, 20% 2-lines-cubic infill, then from 8mm upwards a 1-liner 75% aligned rectilinear spinning 5 degrees every layer..

Actual results

the walls of the rising pipe (fom the hex nut head) are literally printed in thin air (on the infill)

Expected results

walls should be printed on "top" surfaces... or top surface should be extended under the walls...

Project file & Debug log uploads

missing_top_surface_under_vertical_wall.zip

Checklist of files to include

Log file
Project file

Anything else?

No response

*Originally created by @ro0ter on 10/3/2025* ### Is there an existing issue for this problem? - [x] I have searched the existing issues ### OrcaSlicer Version 2.3.1-beta ### Operating System (OS) Windows ### OS Version Windows 10 22H2 ### Additional system information This is my first bug/issue report, hope I`m doing it right. I have been looking through the issues for more than 1hr already and didn't find anything similar.. I remember some function that was strengthening the model under walls, but not sure in which software.. cura maybe? haven't used it in a lot time. Photos for a better understanding: 1. Object: <img width="752" height="524" alt="Image" src="https://github.com/user-attachments/assets/bdf008c2-d7f6-496e-ac2c-011b9eb8859b" /> 2. Inner wall of the raising pipe (note you can see the infill between the vertical inner wall and the "top" surface inside the pipe): <img width="902" height="908" alt="Image" src="https://github.com/user-attachments/assets/3f80b2df-c993-4a91-80b9-16cf9aaf7906" /> 3. Outer wall of the raising pipe (note you can also see the infill between the vertical outer wall and the "top" surafce outside the pipe): <img width="880" height="908" alt="Image" src="https://github.com/user-attachments/assets/e21cee9d-dabf-45f8-a4e4-8d369d8548d8" /> The problem is that if I have a shape with a vertical wall starting from a surface, there will be absolutely no "top layer" printed under the respective wall, but only infill... that will obviously make the part much weaker and will not insulate the inside cavity from the outside world, allowing dust, water and debris to enter the inside of the printed object. If I`m not using some setting correctly, please do tell me.. I`m really desperate in having my prints strong and not have sand / water enter the part... Thank you! ### Printer Ender 3 S1 ### How to reproduce 1. open the attached stl 2. slice the attached stl 3. I use 3 walls, 4 top shells, 3 bottom shells, 20% 2-lines-cubic infill, then from 8mm upwards a 1-liner 75% aligned rectilinear spinning 5 degrees every layer.. ### Actual results the walls of the rising pipe (fom the hex nut head) are literally printed in thin air (on the infill) ### Expected results walls should be printed on "top" surfaces... or top surface should be extended under the walls... ### Project file & Debug log uploads [missing_top_surface_under_vertical_wall.zip](https://github.com/user-attachments/files/22682721/missing_top_surface_under_vertical_wall.zip) ### Checklist of files to include - [ ] Log file - [x] Project file ### Anything else? _No response_

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Reference: github/OrcaSlicer#2009