<p><strong>Use Solid Inspector to fix problems</strong></p>
<p>Before exporting your Sketchup model to STL use Solid Inspector. It is available for free from the Sketchup extensions page and will detect reversed faces, stray edges, surface borders. The &quot;main problems&quot; mentioned above are then eliminated.</p>

CC BY-SA 4.0
2022-07-21T22:57:57.203Z
2022-07-21T22:57:57.203Z
Ast Pace
<p>Sketchup is known for creating print-preventing problems of this nature.</p>
<p>Consider to run your STL file through a checker that will determine if the model is manifold or has self-intersecting faces. One can use Meshmixer feature, Analysis, Inspector, or also Windows 3DBuilder, which will perform a repair if desired. It is possible that the repair will result in a filled space, however, which would require editing in the original program.</p>

CC BY-SA 4.0
2022-07-20T10:52:57.697Z
The online version of Sketchup has this capability built in, just not in the free tier. It is called the 'Solid Inspector'.
This inspector would have caught the issue in the original post, as I believe the inner edge of the hole to have reversed faces - like another commenter on this thread mentioned.
Joris
CC BY-SA 4.0
2022-07-21T21:56:12.843Z
Thanks buddy, was looking for the "free option" though. I think @astPace got it though, It IS free as an extension in the extension warehouse.
Jim
CC BY-SA 4.0
2022-07-18T08:50:04.190Z
2022-07-18T08:50:04.190Z
fred_dot_u
<p>The main issues with Sketchup are making sure the inner and outer direction of the surfaces are correct and deleting internal surfaces made by Sketchup, that shouldn't be there. My guess is the filled in hole in the middle is due to a setting in the slicer to fill in inner surfaces.</p>

CC BY-SA 4.0
2022-07-21T22:11:54.680Z
2022-07-21T22:11:54.680Z
Perry Webb
<p>I've created a little enclosure for a project in sketchup
<a href="https://i.sstatic.net/m8AB9.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/m8AB9.png" alt="enter image description here" /></a></p>
<p>I then exported the .STL</p>
<p>When I open it in Creality slicer 4.8 or Cura 5.0 It looks like this
<a href="https://i.sstatic.net/uD4eb.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/uD4eb.png" alt="enter image description here" /></a></p>
<p>I thought that the red was &quot;overhang that needs support&quot; (but can also mean a shell?)</p>
<p>Hoever, that's not the irritating part. That would be the grey in the middle where the &quot;hole&quot; should be.</p>
<p>When I slice it, it looks like this:
<a href="https://i.sstatic.net/ew0yy.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ew0yy.png" alt="enter image description here" /></a></p>
<p>I didn't notice this before I started printing and 4 hours into the print I noticed that it was just completely ignoring the window and was considering it as a part of the base.</p>
<p>Why is it doing this and how can I fix it?</p>
<p>I've tried editing the original sketchup model a number of times, but I keep getting the same result.</p>
<p>I read the question and answer at <a href="https://3dprinting.stackexchange.com/questions/5068/empty-space-in-model-is-getting-filled">Empty space in model is getting filled</a> but I'm not 100% sure that this is the solution I'm looking for.</p>
<p>The slicer, knows enough to see that the hole should be there, as it is rendering in a shaded area. It feels like there is a setting or some such that is &quot;print the shaded area&quot; with a checkbox (on or off) - and if that setting is there, someone please tell me where to find it!</p>
<p>I've also tried importing the STL into other programs (like fusion 360) and RE-exporting the STL, but the issue persists.</p>
<hr />
<p><em>Please note that  <a href="https://3dprinting.stackexchange.com/questions/13352/sketchup-designed-block-with-hole-printed-solid-in-cura">this question</a> seems to be similar to mine, however, there isn't an accepted answer. The one provided below is actually a much better answer.</em></p>

CC BY-SA 4.0
2022-07-20T18:25:12.490Z
The main problem with sketchup is when by itself creates surfaces above the main surface, this happens when we try to make a surface and the supposed wall is not at the same height, so the surface created is not flat. Also the walls with inverted side may provoke the slicer to have a wrong interpretation.
Fernando Baltazar
CC BY-SA 4.0
2022-07-23T12:47:15.737Z
Does this answer your question? [Sketchup designed "Block with hole" printed solid in Cura](https://3dprinting.stackexchange.com/questions/13352/sketchup-designed-block-with-hole-printed-solid-in-cura)
Trish
CC BY-SA 4.0
2022-07-23T12:50:13.187Z
Also: https://3dprinting.stackexchange.com/questions/13667/sketchup-free-stl-import-in-freecad-not-working-with-fasteners-workbench https://3dprinting.stackexchange.com/questions/14084/eliminating-unwanted-internal-surfaces/14086#14086 and https://3dprinting.stackexchange.com/questions/11013/slicer-is-adding-additional-floor-bed/14309#14309
Trish
CC BY-SA 4.0
2022-07-23T18:24:44.577Z
@FernandoBaltazar - Please post your comment as an answer.
Greenonline
CC BY-SA 4.0
2022-07-25T15:50:54.343Z
The question you mean to link to has no self answer.
Trish
<sketchup>
Disparity between Sketchup STL and Slicer
Jim
# Disparity between Sketchup STL and Slicer

(Asked by: username_0 on 2022-07-18)

I've created a little enclosure for a project in sketchup
[![enter image description here](https://i.sstatic.net/m8AB9.png)](https://i.sstatic.net/m8AB9.png)

I then exported the .STL

When I open it in Creality slicer 4.8 or Cura 5.0 It looks like this
[![enter image description here](https://i.sstatic.net/uD4eb.png)](https://i.sstatic.net/uD4eb.png)

I thought that the red was "overhang that needs support" (but can also mean a shell?)

Hoever, that's not the irritating part. That would be the grey in the middle where the "hole" should be.

When I slice it, it looks like this:
[![enter image description here](https://i.sstatic.net/ew0yy.png)](https://i.sstatic.net/ew0yy.png)

I didn't notice this before I started printing and 4 hours into the print I noticed that it was just completely ignoring the window and was considering it as a part of the base.

Why is it doing this and how can I fix it?

I've tried editing the original sketchup model a number of times, but I keep getting the same result.

I read the question and answer at [Empty space in model is getting filled](https://3dprinting.stackexchange.com/questions/5068/empty-space-in-model-is-getting-filled) but I'm not 100% sure that this is the solution I'm looking for.

The slicer, knows enough to see that the hole should be there, as it is rendering in a shaded area. It feels like there is a setting or some such that is "print the shaded area" with a checkbox (on or off) - and if that setting is there, someone please tell me where to find it!

I've also tried importing the STL into other programs (like fusion 360) and RE-exporting the STL, but the issue persists.

---

*Please note that [this question](https://3dprinting.stackexchange.com/questions/13352/sketchup-designed-block-with-hole-printed-solid-in-cura) seems to be similar to mine, however, there isn't an accepted answer. The one provided below is actually a much better answer.*

**Tags:** sketchup

> **Comments:**
> **username_1**: The main problem with sketchup is when by itself creates surfaces above the main surface, this happens when we try to make a surface and the supposed wall is not at the same height, so the surface created is not flat. Also the walls with inverted side may provoke the slicer to have a wrong interpretation.  
> **username_2**: Does this answer your question? [Sketchup designed "Block with hole" printed solid in Cura](https://3dprinting.stackexchange.com/questions/13352/sketchup-designed-block-with-hole-printed-solid-in-cura)  
> **username_2**: Also: https://3dprinting.stackexchange.com/questions/13667/sketchup-free-stl-import-in-freecad-not-working-with-fasteners-workbench https://3dprinting.stackexchange.com/questions/14084/eliminating-unwanted-internal-surfaces/14086#14086 and https://3dprinting.stackexchange.com/questions/11013/slicer-is-adding-additional-floor-bed/14309#14309  
> **username_3**: @username_1 - Please post your comment as an answer.  
> **username_2**: The question you mean to link to has no self answer.  

---

## 3 answers

### Answer by username_4 on 2022-07-21. Score: 3 | Accepted answer

**Use Solid Inspector to fix problems**

Before exporting your Sketchup model to STL use Solid Inspector. It is available for free from the Sketchup extensions page and will detect reversed faces, stray edges, surface borders. The "main problems" mentioned above are then eliminated.


---

### Answer by username_5 on 2022-07-18. Score: 3

Sketchup is known for creating print-preventing problems of this nature.

Consider to run your STL file through a checker that will determine if the model is manifold or has self-intersecting faces. One can use Meshmixer feature, Analysis, Inspector, or also Windows 3DBuilder, which will perform a repair if desired. It is possible that the repair will result in a filled space, however, which would require editing in the original program.

> **Comments:**
> **username_6**: The online version of Sketchup has this capability built in, just not in the free tier. It is called the 'Solid Inspector'. This inspector would have caught the issue in the original post, as I believe the inner edge of the hole to have reversed faces - like another commenter on this thread mentioned.  
> **username_0**: Thanks buddy, was looking for the "free option" though. I think @astPace got it though, It IS free as an extension in the extension warehouse.  

---

### Answer by username_7 on 2022-07-21. Score: 3

The main issues with Sketchup are making sure the inner and outer direction of the surfaces are correct and deleting internal surfaces made by Sketchup, that shouldn't be there. My guess is the filled in hole in the middle is due to a setting in the slicer to fill in inner surfaces.


---

