<p>This may be related to a characteristic of the numerous slicers methods of handling single thickness walls. If your model's wall is of insufficient width, it &quot;ceases to exist&quot; in the slicer. <a href="https://community.ultimaker.com/topic/21855-how-to-create-single-wall-prints-bug/" rel="nofollow noreferrer">Ultimaker's community forum</a> has a reference that may be of value, second post to the linked page:</p>
<blockquote>
<p>This is known. It's a limitation of how Cura calculates these things:
Your model outline is inset by half the line width. If anything
remains, it is printed with the normal line width. If nothing remains,
only the &quot;Print Thin Walls&quot; option may still save you. If two lines
overlap a lot, then one of the two will have its extrusion rate
reduced to prevent overextrusion. You'll ooze some filament there but
hopefully not too much since there is a backpressure from the earlier
printed line.</p>
</blockquote>
<p>According to that same forum (and likely other locations on the internet), there is a setting for &quot;print thin walls&quot; that may solve the problem. The original poster discovered that it did not, for his model and had to increase wall thickness in the design software.</p>

CC BY-SA 4.0
2023-03-19T00:02:36.350Z
2023-03-19T00:02:36.350Z
fred_dot_u
<p>To me the resulting print pattern reminds me of a common error with blender: the model contains either no volume, not enough volume <a href="https://3dprinting.stackexchange.com/a/20705/8884">as noted by fred_dot_u</a> or the surfaces are inverted.</p>
<p>Further reading to fix your model:</p>
<ul>
<li><a href="https://3dprinting.stackexchange.com/questions/15868/cura-messes-up-my-print-how-can-i-make-it-print-what-i-see-in-blender">Cura messes up my print. How can I make it print what I see in Blender?</a></li>
<li><a href="https://3dprinting.stackexchange.com/q/15048/8884">3D model with errors when exporting to Cura</a></li>
<li><a href="https://3dprinting.stackexchange.com/q/11013/8884">Slicer is adding additional floor bed</a></li>
<li><a href="https://3dprinting.stackexchange.com/q/10437/8884">Problem in 3D printing of an empty model</a></li>
</ul>

CC BY-SA 4.0
2023-05-15T14:16:00.123Z
2023-05-15T14:23:24.753Z
2023-05-15T14:23:24.753Z
Trish
<p>I created a box in Blender and exported that into an STL file and it seems to be failing to render the correct walls. The box looks like this:</p>
<p><a href="https://i.sstatic.net/ScTFu.png" rel="nofollow noreferrer" title="Nice looking box"><img src="https://i.sstatic.net/ScTFu.png" alt="Nice looking box" title="Nice looking box" /></a></p>
<p>But when I open it in Cura, it looks like this:</p>
<p><a href="https://i.sstatic.net/O8lt1.png" rel="nofollow noreferrer" title="Not so nice looking box"><img src="https://i.sstatic.net/O8lt1.png" alt="Not so nice looking box" title="Not so nice looking box" /></a></p>
<p>Is there something I'm exporting incorrectly or something else I'm missing?</p>

CC BY-SA 4.0
2023-03-18T23:11:56.527Z
That is very common and asked before, I'll look up a linked answer.
0scar
CC BY-SA 4.0
2023-05-15T07:41:27.043Z
@chicks - was there a reason for editing in `STIL`, rather than `STL` or was that a typo..? I had failed to notice it when I approved the edit, but now I see it.
Greenonline
CC BY-SA 4.0
2023-05-15T12:11:03.860Z
I was just trying to capitalize it.  Sorry for the typo.
chicks
<3d-models><stl>
STL exported through Blender not watertight
Haraja
# STL exported through Blender not watertight

(Asked by: username_0 on 2023-03-18)

I created a box in Blender and exported that into an STL file and it seems to be failing to render the correct walls. The box looks like this:

[![Nice looking box](https://i.sstatic.net/ScTFu.png "Nice looking box")](https://i.sstatic.net/ScTFu.png "Nice looking box")

But when I open it in Cura, it looks like this:

[![Not so nice looking box](https://i.sstatic.net/O8lt1.png "Not so nice looking box")](https://i.sstatic.net/O8lt1.png "Not so nice looking box")

Is there something I'm exporting incorrectly or something else I'm missing?

**Tags:** 3d-models, stl

> **Comments:**
> **username_1**: That is very common and asked before, I'll look up a linked answer.  
> **username_2**: @username_3 - was there a reason for editing in `STIL`, rather than `STL` or was that a typo..? I had failed to notice it when I approved the edit, but now I see it.  
> **username_3**: I was just trying to capitalize it.  Sorry for the typo.  

---

## 2 answers

### Answer by username_4 on 2023-03-19. Score: 3

This may be related to a characteristic of the numerous slicers methods of handling single thickness walls. If your model's wall is of insufficient width, it "ceases to exist" in the slicer. [Ultimaker's community forum](https://community.ultimaker.com/topic/21855-how-to-create-single-wall-prints-bug/) has a reference that may be of value, second post to the linked page:

> This is known. It's a limitation of how Cura calculates these things:
> Your model outline is inset by half the line width. If anything
> remains, it is printed with the normal line width. If nothing remains,
> only the "Print Thin Walls" option may still save you. If two lines
> overlap a lot, then one of the two will have its extrusion rate
> reduced to prevent overextrusion. You'll ooze some filament there but
> hopefully not too much since there is a backpressure from the earlier
> printed line.

According to that same forum (and likely other locations on the internet), there is a setting for "print thin walls" that may solve the problem. The original poster discovered that it did not, for his model and had to increase wall thickness in the design software.


---

### Answer by username_5 on 2023-05-15. Score: 0

To me the resulting print pattern reminds me of a common error with blender: the model contains either no volume, not enough volume [as noted by fred\_dot\_u](https://3dprinting.stackexchange.com/a/20705/8884) or the surfaces are inverted.

Further reading to fix your model:

* [Cura messes up my print. How can I make it print what I see in Blender?](https://3dprinting.stackexchange.com/questions/15868/cura-messes-up-my-print-how-can-i-make-it-print-what-i-see-in-blender)
* [3D model with errors when exporting to Cura](https://3dprinting.stackexchange.com/q/15048/8884)
* [Slicer is adding additional floor bed](https://3dprinting.stackexchange.com/q/11013/8884)
* [Problem in 3D printing of an empty model](https://3dprinting.stackexchange.com/q/10437/8884)


---

