<h2>Nomenclature help</h2>

<ul>
<li>A <strong>Layer</strong> is everything that is printed between the print head moving upwards.

<ul>
<li><code>Layer height</code> is how <strong>tall</strong> each line is. It is in Quality.</li>
</ul></li>
<li>A <strong>Wall</strong> is made up from lines put down next to each other.

<ul>
<li><code>line width</code> is how <strong>thick</strong> a 1-perimeter-strong wall is in the XY-plane. It should never be smaller than the Nozzle Diameter. It is in Quality.</li>
</ul></li>
<li><strong>Nozzle Diameter</strong> is what is the physical diameter of your nozzle. It is located in the printer configuration.</li>
<li>A <strong>Bridge</strong> is printing horizontal layers that connect to walls at the sides but otherwise not connected to the printbed or print.</li>
</ul>

<p><a href="https://i.sstatic.net/dey7I.png" rel="noreferrer"><img src="https://i.sstatic.net/dey7I.png" alt="A simple bridge"></a></p>

<h2>Ultimaker Cura does ignore too thin walls</h2>

<p>Your walls are 0.28 mm thick and your nozzle is most likely 0.4 mm thick. That can't be printed at all, in fact, you are <em>way</em> too thin to be printed: a printer should never print any object that is thinner than its nozzle as that is a perfect way to generate clogs.</p>

<p>Atop that, slicers ignore <em>also</em> what is thinner or exactly as thin as the line width. If the <code>line width</code> is 0.4 mm, and the wall is 0.4 mm, it gets ignored. If the wall is 0.45 mm, it is not. This can be remedied by setting the option <code>print thin walls</code>, but you still need to have one line nozzle-diameter as minimum line width - actually it is common to go about 10% larger for better extrusion.</p>

<h2>Solution</h2>

<p>Strengthen the walls to one <code>line width</code> (usually 0.4 mm) in your CAD-design and activate <code>print thin walls</code> under <code>Shell</code>.</p>

<p><a href="https://i.sstatic.net/v8fzf.png" rel="noreferrer"><img src="https://i.sstatic.net/v8fzf.png" alt="A design with too thin walls"></a></p>

CC BY-SA 4.0
2019-02-02T17:35:24.003Z
Why? If is layer round(since noozle is round) and diameter of layer is 0.28 mm. Why it can't print 0.28mm wall?
Pararera
CC BY-SA 4.0
2019-02-02T17:39:35.137Z
@SilvioCro Layer Thickness is height in Z.
Trish
CC BY-SA 4.0
2019-02-02T17:46:15.653Z
Is 0.56mm too much for bridge?
Pararera
CC BY-SA 4.0
2019-02-02T18:16:56.757Z
@SilvioCro I added a nomenclature touchup. 0.56 mm is perfectly fine.
Trish
CC BY-SA 4.0
2019-02-02T17:31:07.320Z
2019-02-02T18:16:20.310Z
2019-02-02T18:16:20.310Z
Trish
<p>I made a model for my 3D clock. Model has few vertical holes so I made one layer thick bridge for every hole. In Fusion 360 everything looks fine, but CURA (version 3.6.0) doesn't want to print those Bridges. Why?</p>

<p>The Full Wall is 1.68mm thick(in Fusion), <code>infill</code> is 20%, <code>wall line count</code> is 1, <code>layer height</code> is 0.28mm, the support-bridges are designed to be this thick too.</p>

<p>I'm not sure will be material stable above holes without Bridges.</p>

<p><a href="https://i.sstatic.net/9iuec.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/9iuec.png" alt="Bridges in Fusion 360"></a></p>

<p><a href="https://i.sstatic.net/EfF5o.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/EfF5o.png" alt="Model in CURA 3.6.0"></a></p>

<p><a href="https://i.sstatic.net/oLdpe.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/oLdpe.png" alt="Hole at close"></a></p>

CC BY-SA 4.0
2019-02-02T17:28:14.587Z
what's the line width and the width of the wall that should be printed there?
Trish
CC BY-SA 4.0
2019-02-02T17:32:49.417Z
In Fusion walls are 1.68mm. Those Bridges are 0.28mm thick(same as layer height).
Pararera
CC BY-SA 4.0
2019-02-02T17:33:31.587Z
layer height is Z thickness, you need to check Line Width, which is XY thickness.
Trish
CC BY-SA 4.0
2019-02-04T19:35:14.050Z
While this isn't quite relevant to the question as asked, it looks like you are attempting to design supports for the top of the hole in your CAD program, which you will then remove after printing. I would not recommend this approach, but instead use your slicer (CURA) to generate the needed supports. These will be placed where they are needed, and should be easier to remove from the model. Alternatively, you can design so that you don't need supports (or as much). In the case of horizontal holes like these, you might make a "teardrop" shape that limits to overhang angle.
mbmcavoy
CC BY-SA 4.0
2019-02-04T19:41:35.477Z
@mbmcavoy This "custom made support" is one layer thick(0.4mm), can't be thicker than this. Hole is tear drop shape because slicer cuts end of the hole. Why I did those supports? They use less time and material to print. Also, wall is less than 2mm thick.
Pararera
CC BY-SA 4.0
2019-02-04T19:44:53.690Z
It seems what you are intending is one wall thick. What is the reason it cannot be thicker? Is that why you are not using supports generated by Cura?
mbmcavoy
CC BY-SA 4.0
2019-02-04T19:48:11.020Z
Regarding the tear drop holes, I don't mean the appearance of your circular hole in Cura with the loss of precision. I mean to intentionally design a tear drop shape in CAD. Make a circle and add tangent lanes up to a point on top. The lines should have an angle of about 45 degrees (depending on your printer's overhang performance.) You should be able to print such a hole with no support needed.
mbmcavoy
CC BY-SA 4.0
2019-02-04T19:50:50.347Z
@mbmcavoy Nozzle size? Stock 0.4mm nozzle that comes with printer. Whole model is printable without supports. Reason why I added those "support walls" is because I want to be sure that material above hole doesn't collaps. Not big deal to remove, print etc… Btw layer height is 0.28mm
Pararera
CC BY-SA 4.0
2019-02-04T20:15:15.693Z
I guess I'm confused - you can always make a feature larger than your nozzle, just not smaller. You say you can print the model without supports, but this feature is specifically a support - that's what they do; make sure overhanging features don't collapse.
mbmcavoy
<ultimaker-cura><fusion360>
CURA doesn't want print bridges
Pararera
# CURA doesn't want print bridges

(Asked by: username_0 on 2019-02-02)

I made a model for my 3D clock. Model has few vertical holes so I made one layer thick bridge for every hole. In Fusion 360 everything looks fine, but CURA (version 3.6.0) doesn't want to print those Bridges. Why?

The Full Wall is 1.68mm thick(in Fusion), `infill` is 20%, `wall line count` is 1, `layer height` is 0.28mm, the support-bridges are designed to be this thick too.

I'm not sure will be material stable above holes without Bridges.

[![Bridges in Fusion 360](https://i.sstatic.net/9iuec.png)](https://i.sstatic.net/9iuec.png)

[![Model in CURA 3.6.0](https://i.sstatic.net/EfF5o.png)](https://i.sstatic.net/EfF5o.png)

[![Hole at close](https://i.sstatic.net/oLdpe.png)](https://i.sstatic.net/oLdpe.png)

**Tags:** ultimaker-cura, fusion360
> **Comments:**
> **username_1**: what's the line width and the width of the wall that should be printed there?  
> **username_0**: In Fusion walls are 1.68mm. Those Bridges are 0.28mm thick(same as layer height).  
> **username_1**: layer height is Z thickness, you need to check Line Width, which is XY thickness.  
> **username_2**: While this isn't quite relevant to the question as asked, it looks like you are attempting to design supports for the top of the hole in your CAD program, which you will then remove after printing. I would not recommend this approach, but instead use your slicer (CURA) to generate the needed supports. These will be placed where they are needed, and should be easier to remove from the model. Alternatively, you can design so that you don't need supports (or as much). In the case of horizontal holes like these, you might make a "teardrop" shape that limits to overhang angle.  
> **username_0**: @mbmcavoy This "custom made support" is one layer thick(0.4mm), can't be thicker than this. Hole is tear drop shape because slicer cuts end of the hole. Why I did those supports? They use less time and material to print. Also, wall is less than 2mm thick.  
> **username_2**: It seems what you are intending is one wall thick. What is the reason it cannot be thicker? Is that why you are not using supports generated by Cura?  
> **username_2**: Regarding the tear drop holes, I don't mean the appearance of your circular hole in Cura with the loss of precision. I mean to intentionally design a tear drop shape in CAD. Make a circle and add tangent lanes up to a point on top. The lines should have an angle of about 45 degrees (depending on your printer's overhang performance.) You should be able to print such a hole with no support needed.  
> **username_0**: @mbmcavoy Nozzle size? Stock 0.4mm nozzle that comes with printer. Whole model is printable without supports. Reason why I added those "support walls" is because I want to be sure that material above hole doesn't collaps. Not big deal to remove, print etc… Btw layer height is 0.28mm  
> **username_2**: I guess I'm confused - you can always make a feature larger than your nozzle, just not smaller. You say you can print the model without supports, but this feature is specifically a support - that's what they do; make sure overhanging features don't collapse.  

---

## 1 answers

### Answer by username_1 on 2019-02-02. Score: 5 | Accepted answer

## Nomenclature help

* A **Layer** is everything that is printed between the print head moving upwards.
  + `Layer height` is how **tall** each line is. It is in Quality.
* A **Wall** is made up from lines put down next to each other.
  + `line width` is how **thick** a 1-perimeter-strong wall is in the XY-plane. It should never be smaller than the Nozzle Diameter. It is in Quality.
* **Nozzle Diameter** is what is the physical diameter of your nozzle. It is located in the printer configuration.
* A **Bridge** is printing horizontal layers that connect to walls at the sides but otherwise not connected to the printbed or print.

[![A simple bridge](https://i.sstatic.net/dey7I.png)](https://i.sstatic.net/dey7I.png)

## Ultimaker Cura does ignore too thin walls

Your walls are 0.28 mm thick and your nozzle is most likely 0.4 mm thick. That can't be printed at all, in fact, you are *way* too thin to be printed: a printer should never print any object that is thinner than its nozzle as that is a perfect way to generate clogs.

Atop that, slicers ignore *also* what is thinner or exactly as thin as the line width. If the `line width` is 0.4 mm, and the wall is 0.4 mm, it gets ignored. If the wall is 0.45 mm, it is not. This can be remedied by setting the option `print thin walls`, but you still need to have one line nozzle-diameter as minimum line width - actually it is common to go about 10% larger for better extrusion.

## Solution

Strengthen the walls to one `line width` (usually 0.4 mm) in your CAD-design and activate `print thin walls` under `Shell`.

[![A design with too thin walls](https://i.sstatic.net/v8fzf.png)](https://i.sstatic.net/v8fzf.png)

> **Comments:**
> **username_0**: Why? If is layer round(since noozle is round) and diameter of layer is 0.28 mm. Why it can't print 0.28mm wall?  
> **username_1**: @SilvioCro Layer Thickness is height in Z.  
> **username_0**: Is 0.56mm too much for bridge?  
> **username_1**: @SilvioCro I added a nomenclature touchup. 0.56 mm is perfectly fine.  

---

