<h2>Simplify the order of operations</h2>
<p>Sometimes, it is way easier to do the order of operations in a different order:</p>
<p>First, create the thickness of the body. Only then then subtract the rotation profile and last sweep the the outer profile subtractively</p>
<p><a href="https://i.sstatic.net/yFQhh.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/yFQhh.png" alt="enter image description here" /></a>
<a href="https://i.sstatic.net/yWxOT.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/yWxOT.png" alt="enter image description here" /></a>
<a href="https://i.sstatic.net/TIZLQ.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/TIZLQ.png" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2024-02-04T13:39:29.453Z
I'm still working on my "when to think additively and when to think subtractively" strategy, and this is clearly a case of me taking the wrong route. I _did_ manage to resolve it with my model by turning it into surfaces, deleting some of the inner ones and then stitching it back together, but your strategy would have been much simpler.
Chris
CC BY-SA 4.0
2024-02-03T19:40:07.983Z
2024-02-03T19:40:07.983Z
Trish
<p>I don't know if there is a tool that can do that (would be very helpful), but you could use boolean operators to do the same!</p>
<p>A simplified version of your product looks like:</p>
<p><a href="https://i.sstatic.net/NMiTf.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/NMiTf.png" alt="enter image description here" /></a></p>
<p>When you create an box , or part of a box of the same height in the part you need to fill the void it will kook like (2 separate bodies in one view):</p>
<p><a href="https://i.sstatic.net/rofV2.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/rofV2.png" alt="enter image description here" /></a></p>
<p>Now use a boolean operator &quot;Split Boby&quot;:</p>
<p><a href="https://i.sstatic.net/cjOFs.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/cjOFs.png" alt="enter image description here" /></a></p>
<p>You can subtract your shape from the box:</p>
<p><a href="https://i.sstatic.net/Az7aw.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Az7aw.png" alt="enter image description here" /></a></p>
<p>to get multiple parts (3 parts in this case):</p>
<p><a href="https://i.sstatic.net/Uw08C.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Uw08C.png" alt="enter image description here" /></a></p>
<p>Now use a boolean operator to glue the parts together (option combine):</p>
<p><a href="https://i.sstatic.net/TbqaZ.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/TbqaZ.png" alt="enter image description here" /></a></p>
<p>This will give you your filled void:</p>
<p><a href="https://i.sstatic.net/nphaO.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/nphaO.png" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2024-02-03T19:41:55.027Z
That's the unelegant solution and can fail for very complex bodies
Trish
CC BY-SA 4.0
2024-02-03T23:11:38.450Z
Maybe, but it doesn't require the OP to start over again! 
0scar
CC BY-SA 4.0
2024-02-03T23:16:50.870Z
you mean modify all bodies before? ;)
Trish
CC BY-SA 4.0
2024-02-03T15:46:53.703Z
2024-02-03T15:46:53.703Z
0scar
<p>Starting from this sketch:</p>
<p><a href="https://i.sstatic.net/GnVZY.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/GnVZY.png" alt="Sketch showing a curved profile" /></a></p>
<p>I've revolved and extruded it to result in the body shown:</p>
<p><a href="https://i.sstatic.net/bGAiy.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/bGAiy.jpg" alt="3D body resulting from revolving and extruding the sketch" /></a></p>
<p>This is destined to be printed, so I need to fill in the cavity of the stick-y-out-y bit. I can use Surface-&gt;Patch to make it <em>look</em> correct from the outside, but there's still a void within:</p>
<p><a href="https://i.sstatic.net/4AM6i.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/4AM6i.jpg" alt="Close-up of cavity" /></a></p>
<p><a href="https://i.sstatic.net/blLMo.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/blLMo.png" alt="3D body with hole filled in with a surface patch" /></a></p>
<p><a href="https://i.sstatic.net/Fuz9r.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/Fuz9r.png" alt="Sectional analysis revealing cavity" /></a></p>
<p>I've searched using phrases such as &quot;fusion join surface to body&quot; &quot;fusion fill void within body&quot; and have only found results talking about making a body exclusively from surfaces. One promising sounding option was &quot;boundary fill&quot;, but it seems to have no effect in this case.</p>
<p>What is the correct tool / technique to use here?</p>

CC BY-SA 4.0
2024-02-03T14:46:29.447Z
How is this related to 3D printing? For 3D design and modeling questions this is mandatory.
Trish
CC BY-SA 4.0
2024-02-03T15:48:37.623Z
Just saying you will be printing it will be enough! 
0scar
<fusion360>
How to fill a void within a body?
Chris
# How to fill a void within a body?

(Asked by: username_0 on 2024-02-03)

Starting from this sketch:

[![Sketch showing a curved profile](https://i.sstatic.net/GnVZY.png)](https://i.sstatic.net/GnVZY.png)

I've revolved and extruded it to result in the body shown:

[![3D body resulting from revolving and extruding the sketch](https://i.sstatic.net/bGAiy.jpg)](https://i.sstatic.net/bGAiy.jpg)

This is destined to be printed, so I need to fill in the cavity of the stick-y-out-y bit. I can use Surface->Patch to make it *look* correct from the outside, but there's still a void within:

[![Close-up of cavity](https://i.sstatic.net/4AM6i.jpg)](https://i.sstatic.net/4AM6i.jpg)

[![3D body with hole filled in with a surface patch](https://i.sstatic.net/blLMo.png)](https://i.sstatic.net/blLMo.png)

[![Sectional analysis revealing cavity](https://i.sstatic.net/Fuz9r.png)](https://i.sstatic.net/Fuz9r.png)

I've searched using phrases such as "fusion join surface to body" "fusion fill void within body" and have only found results talking about making a body exclusively from surfaces. One promising sounding option was "boundary fill", but it seems to have no effect in this case.

What is the correct tool / technique to use here?

**Tags:** fusion360
> **Comments:**
> **username_1**: How is this related to 3D printing? For 3D design and modeling questions this is mandatory.  
> **username_2**: Just saying you will be printing it will be enough!   

---

## 2 answers

### Answer by username_1 on 2024-02-03. Score: 3 | Accepted answer

## Simplify the order of operations

Sometimes, it is way easier to do the order of operations in a different order:

First, create the thickness of the body. Only then then subtract the rotation profile and last sweep the the outer profile subtractively

[![enter image description here](https://i.sstatic.net/yFQhh.png)](https://i.sstatic.net/yFQhh.png)
[![enter image description here](https://i.sstatic.net/yWxOT.png)](https://i.sstatic.net/yWxOT.png)
[![enter image description here](https://i.sstatic.net/TIZLQ.png)](https://i.sstatic.net/TIZLQ.png)

> **Comments:**
> **username_0**: I'm still working on my "when to think additively and when to think subtractively" strategy, and this is clearly a case of me taking the wrong route. I _did_ manage to resolve it with my model by turning it into surfaces, deleting some of the inner ones and then stitching it back together, but your strategy would have been much simpler.  

---

### Answer by username_2 on 2024-02-03. Score: 2

I don't know if there is a tool that can do that (would be very helpful), but you could use boolean operators to do the same!

A simplified version of your product looks like:

[![enter image description here](https://i.sstatic.net/NMiTf.png)](https://i.sstatic.net/NMiTf.png)

When you create an box , or part of a box of the same height in the part you need to fill the void it will kook like (2 separate bodies in one view):

[![enter image description here](https://i.sstatic.net/rofV2.png)](https://i.sstatic.net/rofV2.png)

Now use a boolean operator "Split Boby":

[![enter image description here](https://i.sstatic.net/cjOFs.png)](https://i.sstatic.net/cjOFs.png)

You can subtract your shape from the box:

[![enter image description here](https://i.sstatic.net/Az7aw.png)](https://i.sstatic.net/Az7aw.png)

to get multiple parts (3 parts in this case):

[![enter image description here](https://i.sstatic.net/Uw08C.png)](https://i.sstatic.net/Uw08C.png)

Now use a boolean operator to glue the parts together (option combine):

[![enter image description here](https://i.sstatic.net/TbqaZ.png)](https://i.sstatic.net/TbqaZ.png)

This will give you your filled void:

[![enter image description here](https://i.sstatic.net/nphaO.png)](https://i.sstatic.net/nphaO.png)

> **Comments:**
> **username_1**: That's the unelegant solution and can fail for very complex bodies  
> **username_2**: Maybe, but it doesn't require the OP to start over again!   
> **username_1**: you mean modify all bodies before? ;)  

---

