<p>You should increase the top layer thickness <a href="https://support.ultimaker.com/hc/en-us/articles/360012512340-Shell-settings" rel="nofollow noreferrer">according to Ultimaker Cura support</a>:</p>
<blockquote>
<h1>Top/bottom thickness</h1>
<p>With the top/bottom thickness you can set the thickness of the solidly printed top and bottom layers of the print. A higher value ensures all gaps on the top and bottom layers are closed completely. However, this can also increase the print time and amount of filament used.</p>
<p>It is advised to always use a multiple of the layer height for the thickness of the top and bottom. This means, for example, that with a layer height of 0.15 mm, it’s better to set the top/bottom thickness to 0.6 mm rather than 0.7 mm.</p>
</blockquote>

CC BY-SA 4.0
2020-12-28T02:11:20.797Z
Thanks. I played around with top layer thickness, but I can't seem to get that single top layer to cover the entire curved shell.
bigpow
CC BY-SA 4.0
2020-12-28T08:13:50.153Z
@bigpow What do you mean? A single layer instead of the multiple layers? That is not simple, it is called non-planar slicing, see e.g. [this website](https://tams.informatik.uni-hamburg.de/research/3d-printing/nonplanar_printing/index.php).
0scar
CC BY-SA 4.0
2021-01-16T09:51:31.340Z
Thanks. I'm new. I don't understand what I don't know. I thought it would require editing the original 3D model to increase the poly # (to smoothen the gradation), but then again, that probably be printable since the printer resolution is fixed. Another rabbit hole.
bigpow
CC BY-SA 4.0
2020-12-22T07:25:25.293Z
2020-12-22T07:25:25.293Z
0scar
<p>How do I improve/increase shell coverage so that it covers the entire inner wall?
I've experimented with shell settings, but I can't seem to get it right.</p>
<p>I'm using Creality Slicer 4.2.1 (Cura)</p>
<p>Picture showing the areas in question below:
<a href="https://i.sstatic.net/6ahWw.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/6ahWw.jpg" alt="Areas in question highlighted with blue boxes" /></a></p>

CC BY-SA 4.0
2020-12-22T13:11:06.157Z
Green is "top" red is "wall".
Trish
<ultimaker-cura>
Shell doesn't cover the entire inner wall at some areas
bigpow
# Shell doesn't cover the entire inner wall at some areas

(Asked by: username_0 on 2020-12-21)

How do I improve/increase shell coverage so that it covers the entire inner wall?
I've experimented with shell settings, but I can't seem to get it right.

I'm using Creality Slicer 4.2.1 (Cura)

Picture showing the areas in question below:
[![Areas in question highlighted with blue boxes](https://i.sstatic.net/6ahWw.jpg)](https://i.sstatic.net/6ahWw.jpg)

**Tags:** ultimaker-cura

> **Comments:**
> **username_1**: Green is "top" red is "wall".  

---

## 1 answers

### Answer by username_2 on 2020-12-22. Score: 1 | Accepted answer

You should increase the top layer thickness [according to Ultimaker Cura support](https://support.ultimaker.com/hc/en-us/articles/360012512340-Shell-settings):

> # Top/bottom thickness
>
> With the top/bottom thickness you can set the thickness of the solidly printed top and bottom layers of the print. A higher value ensures all gaps on the top and bottom layers are closed completely. However, this can also increase the print time and amount of filament used.
>
> It is advised to always use a multiple of the layer height for the thickness of the top and bottom. This means, for example, that with a layer height of 0.15 mm, it’s better to set the top/bottom thickness to 0.6 mm rather than 0.7 mm.

> **Comments:**
> **username_0**: Thanks. I played around with top layer thickness, but I can't seem to get that single top layer to cover the entire curved shell.  
> **username_2**: @username_0 What do you mean? A single layer instead of the multiple layers? That is not simple, it is called non-planar slicing, see e.g. [this website](https://tams.informatik.uni-hamburg.de/research/3d-printing/nonplanar_printing/index.php).  
> **username_0**: Thanks. I'm new. I don't understand what I don't know. I thought it would require editing the original 3D model to increase the poly # (to smoothen the gradation), but then again, that probably be printable since the printer resolution is fixed. Another rabbit hole.  

---

