<p>I think you already know that in this print orientation, the tooth breaks off easily. Maybe you can try to print this thing in two parts? Use a horizontal orientation to print the saw-tooth ( with its complicated structure, using organic support might be good) and later combine with the thread?</p>
<p>The other things that I can suggest are:</p>
<ol>
<li><p>Is it possible to make the saw-tooth base wider and thicker, although it will result in a reduced number of teeth in the circle and also make the centre hollow bore smaller? This will increase the surface area bonding the layers in the tooth, thus giving it more strength.</p>
</li>
<li><p>Try altering the printing temperature and layer height. Generally higher temp and lower layer height result in greater strength. You can check out a great 3D Printing YouTuber CNCkitchen's articles:</p>
<ul>
<li><a href="https://www.cnckitchen.com/blog/the-influence-of-extrusion-temperature-on-layer-adhesion" rel="nofollow noreferrer">The Influence of Extrusion Temperature on Layer Adhesion</a></li>
<li><a href="https://www.cnckitchen.com/blog/the-influence-of-layer-height-on-the-strength-of-fdm-3d-prints" rel="nofollow noreferrer">The Influence of Layer Height on the Strength of FDM 3D Prints</a></li>
</ul>
</li>
<li><p>Yeah, using another material such as ABS would give better strength and heat resistivity. But it's also harder to print.</p>
</li>
</ol>

CC BY-SA 4.0
2023-09-15T06:11:35.013Z
Thank you for the interesting links... good stuff.
Amazon Dies In Darkness
CC BY-SA 4.0
2023-09-14T03:59:54.970Z
2023-09-14T04:28:43.033Z
2023-09-14T04:28:43.033Z
JOhn Lau
<h2>Alter geometry</h2>
<p>You experienced one of several factors of print strength:</p>
<ul>
<li>the layer-layer boundary is always weakest</li>
</ul>
<p>So, we need to make sure to strengthen that as much as possible. Let's start with the shape as it is:</p>
<p><a href="https://i.sstatic.net/dTbXg.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/dTbXg.png" alt="Teeth geometry" /></a></p>
<p>Now, how can we increase the strength? Layer-layer strength is linear to area, so can reduce the number of teeth. Next, thicken the walls - two is already more than twice as strong while 4 to 5 is hefty strong.</p>
<p><a href="https://i.sstatic.net/yjM6L.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/yjM6L.png" alt="reduced geometry, thicker walls" /></a></p>

CC BY-SA 4.0
2023-09-14T13:47:29.550Z
2023-09-14T13:47:29.550Z
Trish
<p>I have a 3D object that I print with 0.6 mm nozzle and white PETG.  At the moment I can't print the layers in another direction since I use 3D printed threads.  The object is a de-seeder bit for the sorrel fruit.  <strong>Some of the teeth break off when using it</strong> (see red arrow showing the missing tooth that breaks off when used below).</p>
<p>If you want to see how it's used, I have provided an <a href="https://v.etsystatic.com/video/upload/ac_none,du_15,q_auto:good/sm_len_sorrel_extract_seed_tool_f8g8xk.mp4" rel="nofollow noreferrer">animation/video</a> of it.</p>
<p><a href="https://i.sstatic.net/poJuN.png" rel="nofollow noreferrer" title="Photo of various 3D printed models of de-seeders of various heights with an inset photo of sorrel fruit"><img src="https://i.sstatic.net/poJuN.png" alt="Photo of various 3D printed models of de-seeders of various heights with an inset photo of sorrel fruit" title="Photo of various 3D printed models of de-seeders of various heights with an inset photo of sorrel fruit" /></a></p>
<p><a href="https://i.sstatic.net/xX66N.png" rel="nofollow noreferrer" title="Upclose photo of the 'bit' end of the de-seeder with an arrow showing where a tooth is missing"><img src="https://i.sstatic.net/xX66N.png" alt="Upclose photo of the 'bit' end of the de-seeder with an arrow showing where a tooth is missing" title="Upclose photo of the 'bit' end of the de-seeder with an arrow showing where a tooth is missing" /></a></p>
<p>I was wondering if there was a way to increase the strength of the teeth on the bits from breaking.  I was thinking of using some type of nail hardener but was wondering if that would work or if I should try and use something else.</p>
<p>I'm also willing to try a different 3D material but it needs to be able to withstand summer heat in Florida in a garage which gets to be 97 °F or 36.11 °C and be printed with an E3D Revo 6 nozzle (which is like a hardened steel nozzle).  PLA will just melt/turn rubbery.</p>

CC BY-SA 4.0
2023-09-14T00:08:52.477Z
forces applied parallel to layer lines will provide the results you are experiencing. Even a surface treatment as you suggest will not add much strength. I don't have a materials suggestion, but you are on the right train of thought in that regard.
fred_dot_u
<print-material><petg><print-strength>
How to harden / strengthen the teeth of a 3D print
Rick T
# How to harden / strengthen the teeth of a 3D print

(Asked by: username_0 on 2023-09-13)

I have a 3D object that I print with 0.6 mm nozzle and white PETG. At the moment I can't print the layers in another direction since I use 3D printed threads. The object is a de-seeder bit for the sorrel fruit. **Some of the teeth break off when using it** (see red arrow showing the missing tooth that breaks off when used below).

If you want to see how it's used, I have provided an [animation/video](https://v.etsystatic.com/video/upload/ac_none,du_15,q_auto:good/sm_len_sorrel_extract_seed_tool_f8g8xk.mp4) of it.

[![Photo of various 3D printed models of de-seeders of various heights with an inset photo of sorrel fruit](https://i.sstatic.net/poJuN.png "Photo of various 3D printed models of de-seeders of various heights with an inset photo of sorrel fruit")](https://i.sstatic.net/poJuN.png "Photo of various 3D printed models of de-seeders of various heights with an inset photo of sorrel fruit")

[![Upclose photo of the 'bit' end of the de-seeder with an arrow showing where a tooth is missing](https://i.sstatic.net/xX66N.png "Upclose photo of the 'bit' end of the de-seeder with an arrow showing where a tooth is missing")](https://i.sstatic.net/xX66N.png "Upclose photo of the 'bit' end of the de-seeder with an arrow showing where a tooth is missing")

I was wondering if there was a way to increase the strength of the teeth on the bits from breaking. I was thinking of using some type of nail hardener but was wondering if that would work or if I should try and use something else.

I'm also willing to try a different 3D material but it needs to be able to withstand summer heat in Florida in a garage which gets to be 97 °F or 36.11 °C and be printed with an E3D Revo 6 nozzle (which is like a hardened steel nozzle). PLA will just melt/turn rubbery.

**Tags:** print-material, petg, print-strength
> **Comments:**
> **username_1**: forces applied parallel to layer lines will provide the results you are experiencing. Even a surface treatment as you suggest will not add much strength. I don't have a materials suggestion, but you are on the right train of thought in that regard.  

---

## 2 answers

### Answer by username_4 on 2023-09-14. Score: 2 | Accepted answer

## Alter geometry

You experienced one of several factors of print strength:

* the layer-layer boundary is always weakest

So, we need to make sure to strengthen that as much as possible. Let's start with the shape as it is:

[![Teeth geometry](https://i.sstatic.net/dTbXg.png)](https://i.sstatic.net/dTbXg.png)

Now, how can we increase the strength? Layer-layer strength is linear to area, so can reduce the number of teeth. Next, thicken the walls - two is already more than twice as strong while 4 to 5 is hefty strong.

[![reduced geometry, thicker walls](https://i.sstatic.net/yjM6L.png)](https://i.sstatic.net/yjM6L.png)


---

### Answer by username_2 on 2023-09-14. Score: 3

I think you already know that in this print orientation, the tooth breaks off easily. Maybe you can try to print this thing in two parts? Use a horizontal orientation to print the saw-tooth ( with its complicated structure, using organic support might be good) and later combine with the thread?

The other things that I can suggest are:

1. Is it possible to make the saw-tooth base wider and thicker, although it will result in a reduced number of teeth in the circle and also make the centre hollow bore smaller? This will increase the surface area bonding the layers in the tooth, thus giving it more strength.
2. Try altering the printing temperature and layer height. Generally higher temp and lower layer height result in greater strength. You can check out a great 3D Printing YouTuber CNCkitchen's articles:

   * [The Influence of Extrusion Temperature on Layer Adhesion](https://www.cnckitchen.com/blog/the-influence-of-extrusion-temperature-on-layer-adhesion)
   * [The Influence of Layer Height on the Strength of FDM 3D Prints](https://www.cnckitchen.com/blog/the-influence-of-layer-height-on-the-strength-of-fdm-3d-prints)
3. Yeah, using another material such as ABS would give better strength and heat resistivity. But it's also harder to print.

> **Comments:**
> **username_3**: Thank you for the interesting links... good stuff.  

---

