<p>The problem isn't Cura, rather its the precision of the 3D model. If parts of the model is smaller than the line width the model cannot be printed. A solution to this would be to increase the thickness of the cylinder, decrease the size of the square or reduce the line width to allow that region to be properly fabricated, another solution would be to decrease the line width (line width option) however, keep in mind that you should not reduce the line width beyond the nozzle hole size (nozzle hole &gt; line width). As mentioned before, if the model requires sections that are smaller than the line width, Cura will ignore it. From the image you provided it would seem that the corners are extremely close to the wall of the cylinder which prevents Cura from making a extrusion path, the reason of which I explained above.</p>

CC BY-SA 4.0
2022-01-04T12:08:13.427Z
Welcome to 3DPrinting.SE! Please remember this is not a forum of threaded messages, so I've removed the comment as an answer. The Ultimaker printers default profile have line width smaller than the nozzle hole size, this is not an error but is used for a better quality (explained in their forum), so although I agree on the line width not to be smaller than the nozzle hole size, you can do that to some extend. Depending on the model, tuning the line width might be very useful but take care in not making the line width too small.
0scar
CC BY-SA 4.0
2022-01-04T14:21:40.360Z
I personally prefer to print 10% wider than the nozzle.
Trish
CC BY-SA 4.0
2022-01-04T11:53:47.947Z
2022-01-04T11:53:47.947Z
Michael Lee
<p>You can fix it by changing <strong>Experimental</strong> &gt; <strong>Slicing Tolerance</strong> &gt; <strong>Exclusive</strong></p>
<p><a href="https://i.sstatic.net/htVjk.jpg" rel="nofollow noreferrer" title="Cura screenshot of a model with the Slicing tolerance set to Middle"><img src="https://i.sstatic.net/htVjk.jpg" alt="Cura screenshot of a model with the Slicing tolerance set to Middle" title="Cura screenshot of a model with the Slicing tolerance set to Middle" /></a></p>
<p><a href="https://i.sstatic.net/JGAoE.jpg" rel="nofollow noreferrer" title="Cura screenshot of a model with the Slicing tolerance set to Exclusive"><img src="https://i.sstatic.net/JGAoE.jpg" alt="Cura screenshot of a model with the Slicing tolerance set to Exclusive" title="Cura screenshot of a model with the Slicing tolerance set to Exclusive" /></a></p>

CC BY-SA 4.0
2022-02-24T17:20:30.243Z
2022-02-24T22:19:09.850Z
2022-02-24T22:19:09.850Z
Metinkaan Kulga
<p>I'm trying to print <a href="https://www.thingiverse.com/thing:4461654" rel="nofollow noreferrer">a gear for a robovac deal</a>.</p>
<p>The issue I'm having is with gaps between the walls of the top part of the gear. It needs to have the corners filled to provide stability or else the tabs easily snap. I've tried adjusting the nozzle size, line width, filter gaps and print thin walls but seems to slice with variations on the same issue. Is this a Cura issue? Is there anyway to slice and print this to fill those gaps?</p>
<p><a href="https://i.sstatic.net/0g7zy.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/0g7zy.png" alt="gear with gaps between walls" /></a></p>

CC BY-SA 4.0
2020-12-16T23:38:10.800Z
What does the original model look like? It looks like they took a cylinder object and binary subtracted a cube leaving the walls too thin near the corners. This looks like an extremely small part...
Ron Beyer
CC BY-SA 4.0
2020-12-17T02:35:06.790Z
Hello, thanks for the response. I've messed around with it a bunch more today and I believe that the wall is simply too thin on the corners to be printed correctly. I ended up loading the model into blender and extruding the edges along normals to make it thick enough. Once it printed, I threw it on a little spindle and then used a drill and some sand paper to slowly remove material till it fit the bearing it needed to go into but left just enough to connect the edges. The bearing does compress all the sides so I guess it could work even with the little gaps.
user1726234
CC BY-SA 4.0
2020-12-17T14:39:12.990Z
Using smaller line width may work, but Cura has a bug whereby it makes no difference unless you also enable printing outer walls first.
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2020-12-17T17:57:18.387Z
@R..GitHubSTOPHELPINGICE - thanks for the response, I will give that a go. Good user name!
user1726234
CC BY-SA 4.0
2020-12-17T18:19:53.223Z
also, print thin walls can help...or Thickening the area in the model.
Trish
<ultimaker-cura><slicing>
How do I fill missing corners in Cura
user1726234
# How do I fill missing corners in Cura

(Asked by: username_0 on 2020-12-16)

I'm trying to print [a gear for a robovac deal](https://www.thingiverse.com/thing:4461654).

The issue I'm having is with gaps between the walls of the top part of the gear. It needs to have the corners filled to provide stability or else the tabs easily snap. I've tried adjusting the nozzle size, line width, filter gaps and print thin walls but seems to slice with variations on the same issue. Is this a Cura issue? Is there anyway to slice and print this to fill those gaps?

[![gear with gaps between walls](https://i.sstatic.net/0g7zy.png)](https://i.sstatic.net/0g7zy.png)

**Tags:** ultimaker-cura, slicing
> **Comments:**
> **username_1**: What does the original model look like? It looks like they took a cylinder object and binary subtracted a cube leaving the walls too thin near the corners. This looks like an extremely small part...  
> **username_0**: Hello, thanks for the response. I've messed around with it a bunch more today and I believe that the wall is simply too thin on the corners to be printed correctly. I ended up loading the model into blender and extruding the edges along normals to make it thick enough. Once it printed, I threw it on a little spindle and then used a drill and some sand paper to slowly remove material till it fit the bearing it needed to go into but left just enough to connect the edges. The bearing does compress all the sides so I guess it could work even with the little gaps.  
> **username_2**: Using smaller line width may work, but Cura has a bug whereby it makes no difference unless you also enable printing outer walls first.  
> **username_0**: @R..GitHubSTOPHELPINGICE - thanks for the response, I will give that a go. Good user name!  
> **username_3**: also, print thin walls can help...or Thickening the area in the model.  

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## 2 answers

### Answer by username_4 on 2022-01-04. Score: 4

The problem isn't Cura, rather its the precision of the 3D model. If parts of the model is smaller than the line width the model cannot be printed. A solution to this would be to increase the thickness of the cylinder, decrease the size of the square or reduce the line width to allow that region to be properly fabricated, another solution would be to decrease the line width (line width option) however, keep in mind that you should not reduce the line width beyond the nozzle hole size (nozzle hole > line width). As mentioned before, if the model requires sections that are smaller than the line width, Cura will ignore it. From the image you provided it would seem that the corners are extremely close to the wall of the cylinder which prevents Cura from making a extrusion path, the reason of which I explained above.

> **Comments:**
> **username_5**: Welcome to 3DPrinting.SE! Please remember this is not a forum of threaded messages, so I've removed the comment as an answer. The Ultimaker printers default profile have line width smaller than the nozzle hole size, this is not an error but is used for a better quality (explained in their forum), so although I agree on the line width not to be smaller than the nozzle hole size, you can do that to some extend. Depending on the model, tuning the line width might be very useful but take care in not making the line width too small.  
> **username_3**: I personally prefer to print 10% wider than the nozzle.  

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### Answer by username_6 on 2022-02-24. Score: 1

You can fix it by changing **Experimental** > **Slicing Tolerance** > **Exclusive**

[![Cura screenshot of a model with the Slicing tolerance set to Middle](https://i.sstatic.net/htVjk.jpg "Cura screenshot of a model with the Slicing tolerance set to Middle")](https://i.sstatic.net/htVjk.jpg "Cura screenshot of a model with the Slicing tolerance set to Middle")

[![Cura screenshot of a model with the Slicing tolerance set to Exclusive](https://i.sstatic.net/JGAoE.jpg "Cura screenshot of a model with the Slicing tolerance set to Exclusive")](https://i.sstatic.net/JGAoE.jpg "Cura screenshot of a model with the Slicing tolerance set to Exclusive")


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