<p>I've discovered via Meshmixer that there are duplicate cylinders for the counterbores. I selected &quot;separate shells&quot; which generated two sets of cylinders in the Objects Browser as well as the main body. Selecting each flawed entry in the browser left behind the main body, which is manifold and passes the Analysis/Inspector test sequence.</p>
<p>You can have the repaired file from my <a href="https://www.dropbox.com/s/ys6jzpnfsjbbn3v/FacePlate%20V3r.stl?dl=0" rel="nofollow noreferrer">Dropbox, public folder</a>, or you can perform the process on your own. If you select the former, please let me know when it's retrieved, as I endeavor to keep my space in the free category on Dropbox.</p>

CC BY-SA 4.0
2022-03-03T23:32:12.460Z
2022-03-04T09:09:38.670Z
2022-03-04T09:09:38.670Z
fred_dot_u
<p><a href="https://i.sstatic.net/gXrGX.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/gXrGX.jpg" alt="" /></a></p>
<p><a href="https://i.sstatic.net/pXrMZ.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/pXrMZ.png" alt="Errored surfaces." /></a></p>
<p>The left part of the first picture is giving an inverted circle when lying flat, but the right part of the first picture is how it should be. Same STL for both slice orientations. I tried toggling union overlapping volumes with no luck. I tried to invert face normals with Blender with no luck either.</p>
<p>This gives the error: The highlighted areas indicate either missing or extraneous surfaces. Fix your model and open it again into Cura.</p>
<p><a href="https://sketchfab.com/3d-models/face-plate-v3-d24dc577c0e9420cb683f688405c080a" rel="nofollow noreferrer">Here</a> is a link to the model, <a href="https://www.dropbox.com/s/lukwu7tq1clybgy/FacePlate%20V3.stl?dl=0" rel="nofollow noreferrer">this is another link</a>.</p>
<p>I have tried</p>
<ul>
<li>manually repairing faces with Blender,</li>
<li>repairing the model with Autocad Meshmixer</li>
</ul>
<p>both without success.</p>

CC BY-SA 4.0
2022-03-03T12:12:34.840Z
Cura is explicit on your model, it is broken. A valuable tool was the online Netfabb STL repair service, this now appears to be integrated in Fusion 360.
0scar
CC BY-SA 4.0
2022-03-03T22:13:28.077Z
That's a model error - the bores have inverted faces.
Trish
CC BY-SA 4.0
2022-03-03T23:22:20.970Z
Windows 10 3DBuilder wipes out the counterbores and turns the surface into a flat area, as does Meshmixer. The creator (you?) created a non-manifold object that resists repair.
fred_dot_u
<ultimaker-cura><3d-models><3d-design>
Little help on this Cura slicing or model error?
Snuffles
# Little help on this Cura slicing or model error?

(Asked by: username_0 on 2022-03-03)

[![](https://i.sstatic.net/gXrGX.jpg)](https://i.sstatic.net/gXrGX.jpg)

[![Errored surfaces.](https://i.sstatic.net/pXrMZ.png)](https://i.sstatic.net/pXrMZ.png)

The left part of the first picture is giving an inverted circle when lying flat, but the right part of the first picture is how it should be. Same STL for both slice orientations. I tried toggling union overlapping volumes with no luck. I tried to invert face normals with Blender with no luck either.

This gives the error: The highlighted areas indicate either missing or extraneous surfaces. Fix your model and open it again into Cura.

[Here](https://sketchfab.com/3d-models/face-plate-v3-d24dc577c0e9420cb683f688405c080a) is a link to the model, [this is another link](https://www.dropbox.com/s/lukwu7tq1clybgy/FacePlate%20V3.stl?dl=0).

I have tried

* manually repairing faces with Blender,
* repairing the model with Autocad Meshmixer

both without success.

**Tags:** ultimaker-cura, 3d-models, 3d-design

> **Comments:**
> **username_1**: Cura is explicit on your model, it is broken. A valuable tool was the online Netfabb STL repair service, this now appears to be integrated in Fusion 360.  
> **username_2**: That's a model error - the bores have inverted faces.  
> **username_3**: Windows 10 3DBuilder wipes out the counterbores and turns the surface into a flat area, as does Meshmixer. The creator (you?) created a non-manifold object that resists repair.  

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## 1 answers

### Answer by username_3 on 2022-03-03. Score: 3 | Accepted answer

I've discovered via Meshmixer that there are duplicate cylinders for the counterbores. I selected "separate shells" which generated two sets of cylinders in the Objects Browser as well as the main body. Selecting each flawed entry in the browser left behind the main body, which is manifold and passes the Analysis/Inspector test sequence.

You can have the repaired file from my [Dropbox, public folder](https://www.dropbox.com/s/ys6jzpnfsjbbn3v/FacePlate%20V3r.stl?dl=0), or you can perform the process on your own. If you select the former, please let me know when it's retrieved, as I endeavor to keep my space in the free category on Dropbox.


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