<p>To solve this problem, I tweaked the following:</p>
<ol>
<li><p><strong>Infill Pattern</strong>: Some patterns tend to be more solid than others, going back to <strong>Grid</strong> instead of <strong>Cubic</strong> ensuring that there is a solid base for infill to avoid layer shift in infill as <strong>Cubic</strong> infill is printed in a slanted angle.</p>
</li>
<li><p><strong>Infill layer height</strong>: It seems that the CR-10 Smart is unable to print 0.32 mm infill layer height.</p>
</li>
<li><p><strong>Lowering infill speed</strong>: going from 75 mm/sec to 50 mm/sec as 75 mm/sec infill speed was too much for the extruder as it was unable to keep up with the speed so you will start to notice under-extrusion on the inside of your part,  This under-extrusion will tend to create weak, stringy infill since the nozzle is not able to extrude as much plastic as the software would like.</p>
</li>
</ol>
<p>Attached below the difference between 0.16 mm infill layer height on the right, the model is sturdy and strong.
0.32 mm infill layer height on the left, the model is weak and stringy.</p>
<p><a href="https://i.sstatic.net/CqxNT.jpg" rel="nofollow noreferrer" title="Two 3D printed models with 0.16 mm infill vs 0.32 mm infill"><img src="https://i.sstatic.net/CqxNT.jpg" alt="Two 3D printed models with 0.16 mm infill vs 0.32 mm infill" title="Two 3D printed models with 0.16 mm infill vs 0.32 mm infill" /></a></p>
<p>On my try to print a large scale print the same problem occurred,  very weak infill, which drove me crazy !</p>
<p>Addressing the real problem &quot;Under-Extrusion&quot; .. testing extruder I noticed that there is a crack on the feeder box</p>
<p><img src="https://i.sstatic.net/tGogl.jpg" alt="Cracked Feeder" /></p>
<p>In my opinion it's a bad decision to go for plastic for the feeder, their design uses the lever to shift the plastic box which has the idler pulley (fixed on it) to relieve the pressure on filament.</p>
<p><img src="https://i.sstatic.net/3GbgR.jpg" alt="CR10Smart feeder design" />
<img src="https://i.sstatic.net/ArHBw.jpg" alt="inside of feeder" /></p>
<p>The crack on feeder weakened the grip on filament, causing slippage making the filament to be extruded too thin, which made the filament too weak to stick to each other.</p>
<p>Changing extruder to aluminium kit feeder with tight grip on filament ensured that filament is pushed correctly without slipping and also stopped stringing while nozzle is heating.</p>
<p>Print on left after applying the fix.
<img src="https://i.sstatic.net/u4unY.jpg" alt="before&amp;after" /></p>
<p>Hopes this save someone's the trouble.</p>

CC BY-SA 4.0
2022-01-16T13:00:44.620Z
2022-01-20T15:18:19.133Z
2022-01-20T15:18:19.133Z
Ahmad Magrabi
<p>I had a hard time printing some parts as the brim was printed very well contrary to the first layer, wall, and especially infill. I noticed that filament lines were too thin when printing walls, infill, and the first layer. So the first layer was not sticking to each other.</p>
<p>I suspected that the slicer was the first to investigate, so I printed a model which I already printed before from SD Card and the newly printed part has the exact problems.</p>
<p>Suspecting that filament thread gets cooled very soon so we tried:</p>
<ol>
<li>Printing with more Nozzle Temp (225 °C).<br>
Result: Walls adhered better but still not strong in addition to weak infill.</li>
<li>Then turned on Fan Automatic Control<br>
Result: more nice walls with still weak infill.</li>
</ol>
<p>Setup:</p>
<ul>
<li>Creality CR-10 Smart 3D Printer</li>
<li>Cura Slicer</li>
<li>Material eSUN PLA+ White</li>
<li>Nozzle 0.4 mm</li>
<li>10 % Infill</li>
<li>30 % infill overlap percentage</li>
<li>0.32 mm infill layer thickness.</li>
</ul>
<p><a href="https://i.sstatic.net/ilMVL.jpg" rel="nofollow noreferrer" title="Closeup view of a printed model with lots of filament 'threads'"><img src="https://i.sstatic.net/ilMVL.jpg" alt="Closeup view of a printed model with lots of filament 'threads'" title="Closeup view of a printed model with lots of filament 'threads'" /></a></p>
<p><a href="https://i.sstatic.net/vUki8.jpg" rel="nofollow noreferrer" title="Small printed model with layer lines not adhering"><img src="https://i.sstatic.net/vUki8.jpg" alt="Small printed model with layer lines not adhering" title="Small printed model with layer lines not adhering" /></a></p>

CC BY-SA 4.0
2022-01-13T14:26:14.097Z
can you tell us the following information via an [edit]: Print material, nozzle diameter and line width? You have 0.32 mm layer height, which is very tall and only advisable with nozzles that are 0.45 mm or larger. [It is common to print wider than the nozzle diameter and at max 3/4th the height.](https://3dprinting.stackexchange.com/questions/6965/why-is-it-conventional-to-set-line-width-nozzle-diameter/6967#6967)
Trish
CC BY-SA 4.0
2022-01-13T23:17:35.413Z
Welcome to 3DPrinting.SE. Is this a stock CR-10? You clearly have under extrusion. Please check your extruder. What filament do you use? Please update the question by [edit].
0scar
CC BY-SA 4.0
2022-01-16T09:28:49.540Z
If you buy a CR-10 the first thing you should do is replace the extruder for a microswiss direct-drive system. The stock extruders are absolute garbage and will cause you a lot of problems like this. It will also remove 1 variable and narrow down the source of future problems.
AzulShiva
CC BY-SA 4.0
2022-01-16T10:12:23.397Z
@AzulShiva no, the term "Layer thickness" is, in industry, used for the **height** of a layer, not the **line width**
Trish
CC BY-SA 4.0
2022-01-16T10:21:17.633Z
@Trish Thank you for elaborating, but he certainly isn't using a layer height of 0.32mm, that is not possible. He said "INFILL layer thickness" along with mentioning other infill settings so I assume he meant the infill line distance setting from the Cura slicer and perhaps making a typo in the process.
AzulShiva
CC BY-SA 4.0
2022-01-16T11:09:23.397Z
I meant infill layer height for 0.32 also for the Model layer height, I changed it back to 0.16 mm and I got a better results! for me it's ambiguous why it can't print 0.32 Infill layer height, I didn't have such a problem with CR-10S PRO
Ahmad Magrabi
CC BY-SA 4.0
2022-01-16T16:02:04.943Z
@AhmadMagrabi you can't have a layer height of more than 3/4 of the nozzle diameter because you need to squish the plastic down at least that much to get layer adhesion.
Trish
<ultimaker-cura><creality-cr-10><infill>
CR-10 Smart with weak infill
Ahmad Magrabi
# CR-10 Smart with weak infill

(Asked by: username_0 on 2022-01-13)

I had a hard time printing some parts as the brim was printed very well contrary to the first layer, wall, and especially infill. I noticed that filament lines were too thin when printing walls, infill, and the first layer. So the first layer was not sticking to each other.

I suspected that the slicer was the first to investigate, so I printed a model which I already printed before from SD Card and the newly printed part has the exact problems.

Suspecting that filament thread gets cooled very soon so we tried:

1. Printing with more Nozzle Temp (225 °C).  
   Result: Walls adhered better but still not strong in addition to weak infill.
2. Then turned on Fan Automatic Control  
   Result: more nice walls with still weak infill.

Setup:

* Creality CR-10 Smart 3D Printer
* Cura Slicer
* Material eSUN PLA+ White
* Nozzle 0.4 mm
* 10 % Infill
* 30 % infill overlap percentage
* 0.32 mm infill layer thickness.

[![Closeup view of a printed model with lots of filament 'threads'](https://i.sstatic.net/ilMVL.jpg "Closeup view of a printed model with lots of filament 'threads'")](https://i.sstatic.net/ilMVL.jpg "Closeup view of a printed model with lots of filament 'threads'")

[![Small printed model with layer lines not adhering](https://i.sstatic.net/vUki8.jpg "Small printed model with layer lines not adhering")](https://i.sstatic.net/vUki8.jpg "Small printed model with layer lines not adhering")

**Tags:** ultimaker-cura, creality-cr-10, infill
> **Comments:**
> **username_1**: can you tell us the following information via an [edit]: Print material, nozzle diameter and line width? You have 0.32 mm layer height, which is very tall and only advisable with nozzles that are 0.45 mm or larger. [It is common to print wider than the nozzle diameter and at max 3/4th the height.](https://3dprinting.stackexchange.com/questions/6965/why-is-it-conventional-to-set-line-width-nozzle-diameter/6967#6967)  
> **username_2**: Welcome to 3DPrinting.SE. Is this a stock CR-10? You clearly have under extrusion. Please check your extruder. What filament do you use? Please update the question by [edit].  
> **username_3**: If you buy a CR-10 the first thing you should do is replace the extruder for a microswiss direct-drive system. The stock extruders are absolute garbage and will cause you a lot of problems like this. It will also remove 1 variable and narrow down the source of future problems.  
> **username_1**: @AzulShiva no, the term "Layer thickness" is, in industry, used for the **height** of a layer, not the **line width**  
> **username_3**: @Trish Thank you for elaborating, but he certainly isn't using a layer height of 0.32mm, that is not possible. He said "INFILL layer thickness" along with mentioning other infill settings so I assume he meant the infill line distance setting from the Cura slicer and perhaps making a typo in the process.  
> **username_0**: I meant infill layer height for 0.32 also for the Model layer height, I changed it back to 0.16 mm and I got a better results! for me it's ambiguous why it can't print 0.32 Infill layer height, I didn't have such a problem with CR-10S PRO  
> **username_1**: @AhmadMagrabi you can't have a layer height of more than 3/4 of the nozzle diameter because you need to squish the plastic down at least that much to get layer adhesion.  

---

## 1 answers

### Answer by username_0 on 2022-01-16. Score: 0 | Accepted answer

To solve this problem, I tweaked the following:

1. **Infill Pattern**: Some patterns tend to be more solid than others, going back to **Grid** instead of **Cubic** ensuring that there is a solid base for infill to avoid layer shift in infill as **Cubic** infill is printed in a slanted angle.
2. **Infill layer height**: It seems that the CR-10 Smart is unable to print 0.32 mm infill layer height.
3. **Lowering infill speed**: going from 75 mm/sec to 50 mm/sec as 75 mm/sec infill speed was too much for the extruder as it was unable to keep up with the speed so you will start to notice under-extrusion on the inside of your part, This under-extrusion will tend to create weak, stringy infill since the nozzle is not able to extrude as much plastic as the software would like.

Attached below the difference between 0.16 mm infill layer height on the right, the model is sturdy and strong.
0.32 mm infill layer height on the left, the model is weak and stringy.

[![Two 3D printed models with 0.16 mm infill vs 0.32 mm infill](https://i.sstatic.net/CqxNT.jpg "Two 3D printed models with 0.16 mm infill vs 0.32 mm infill")](https://i.sstatic.net/CqxNT.jpg "Two 3D printed models with 0.16 mm infill vs 0.32 mm infill")

On my try to print a large scale print the same problem occurred, very weak infill, which drove me crazy !

Addressing the real problem "Under-Extrusion" .. testing extruder I noticed that there is a crack on the feeder box

![Cracked Feeder](https://i.sstatic.net/tGogl.jpg)

In my opinion it's a bad decision to go for plastic for the feeder, their design uses the lever to shift the plastic box which has the idler pulley (fixed on it) to relieve the pressure on filament.

![CR10Smart feeder design](https://i.sstatic.net/3GbgR.jpg)
![inside of feeder](https://i.sstatic.net/ArHBw.jpg)

The crack on feeder weakened the grip on filament, causing slippage making the filament to be extruded too thin, which made the filament too weak to stick to each other.

Changing extruder to aluminium kit feeder with tight grip on filament ensured that filament is pushed correctly without slipping and also stopped stringing while nozzle is heating.

Print on left after applying the fix.
![before&after](https://i.sstatic.net/u4unY.jpg)

Hopes this save someone's the trouble.


---

