<p>I have found the issue. My extruder gear was deformed after 4 months of continuous use which made the extruder have a difficult time when a rapid change in extrusion happened. I swapped it out to a new stainless steel one and it has been working well so far.</p>
<p>EDIT:</p>
<p>These inconsistencies are mainly caused by the pressure in the nozzle not changing fast enough. So to solve this you should look at the extruder setup as that is where the pressure is being controlled. Get any gunk out of there and make sure the path is clear and make sure nothing is grinding and you have a good grip on the filament.</p>
<p>To reduce the change in pressure you should play with printing speed, hotend temperature, linear advance if applicable and you may tune extruder jerk and acceleration although not necessary.</p>

CC BY-SA 4.0
2021-02-17T20:22:05.160Z
Thank you! I did the same thing (I was already using aluminum extruder and switched to BMG) and it improved slightly. I found another person having similar issues and I think he was pointing to the same thing - sudden changes in extrusion totally caused it: https://www.reddit.com/r/3Dprinting/comments/ag1xq5/horizontal_lines_on_material_densitygeometry/
Yuxiang Wang
CC BY-SA 4.0
2021-02-17T20:22:28.170Z
My next step will be switching to direct feed. Will update once I have it :)
Yuxiang Wang
CC BY-SA 4.0
2021-02-16T14:35:33.267Z
2021-02-22T17:19:11.020Z
2021-02-22T17:19:11.020Z
Aalian khan
<p>When my Ender 3 prints a top or bottom layer, it leaves a line on the layer. 
<a href="https://i.sstatic.net/ij6ei.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ij6ei.jpg" alt="enter image description here"></a></p>

<p><a href="https://i.sstatic.net/SErLK.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/SErLK.jpg" alt="enter image description here"></a></p>

<ul>
<li>Slicer Cura</li>
<li>Linear Advance: 0.57</li>
<li>Retraction: 3&nbsp;mm @ 35&nbsp;mm/s</li>
<li>Max Speed: 100&nbsp;mm/s</li>
<li>Ironing enabled</li>
<li>Minimum wall flow: 20&nbsp;%</li>
<li>Temperatures: 205&nbsp;&deg;C hotend and 65&nbsp;&deg;C bed</li>
</ul>

<p>My belts are tight enough as I push them they spring back up. I bought a support block for my Z lead screw to help with z banding (I also removed it to see if it will fix the issue but it didn't). I tried 50&nbsp;mm/s, No Infill, swapped out to brand new 0.6&nbsp;mm nozzle (the picture has 0.4&nbsp;mm), Minimum wall-flow to 0&nbsp;% but no improvement. It has to lead me to think its a mechanical issue but I am not sure where to start. </p>

CC BY-SA 4.0
2020-04-24T20:08:38.123Z
Try calibrating again it E steps and, if it doesn't help, try reducing the extrusion multiplier by 1-2%
FarO
CC BY-SA 4.0
2020-04-25T06:34:32.957Z
@FarO I have calibrated e steps and flow rate from E3Ds guide. I tried 95% and 98% extrusion but it made it more more prominent. My current extrusion multiplier is 99.3%
Aalian khan
CC BY-SA 4.0
2020-04-25T07:27:07.607Z
However you see that the excessive extrusion happens only near the edges, where there is deceleration. Are you sure the linear advance calibration is correct?
FarO
CC BY-SA 4.0
2020-04-26T19:40:31.543Z
In the calibration test, there is a bump but its the best compared to the others. I will do another test without LA and check the difference.
Aalian khan
CC BY-SA 4.0
2020-04-30T21:17:39.100Z
There is no difference.just the corners are more bumpy
Aalian khan
CC BY-SA 4.0
2021-02-15T08:11:39.007Z
Sigh... I am running into exactly the same issue. Whenever the layer changes to a new shape, there is a clear line. Have no idea how to get rid of it... Did you remove it eventually?
Yuxiang Wang
CC BY-SA 4.0
2021-02-16T14:36:29.470Z
@YuxiangWang Yes, I have, I have posted the solution for my particular case.
Aalian khan
<print-quality><creality-ender-3>
Surface artifacts when formation of object changes (Layer inconsistency)
Aalian khan
# Surface artifacts when formation of object changes (Layer inconsistency)

(Asked by: username_0 on 2020-04-23)

When my Ender 3 prints a top or bottom layer, it leaves a line on the layer.
[![enter image description here](https://i.sstatic.net/ij6ei.jpg)](https://i.sstatic.net/ij6ei.jpg)

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

* Slicer Cura
* Linear Advance: 0.57
* Retraction: 3 mm @ 35 mm/s
* Max Speed: 100 mm/s
* Ironing enabled
* Minimum wall flow: 20 %
* Temperatures: 205 °C hotend and 65 °C bed

My belts are tight enough as I push them they spring back up. I bought a support block for my Z lead screw to help with z banding (I also removed it to see if it will fix the issue but it didn't). I tried 50 mm/s, No Infill, swapped out to brand new 0.6 mm nozzle (the picture has 0.4 mm), Minimum wall-flow to 0 % but no improvement. It has to lead me to think its a mechanical issue but I am not sure where to start.

**Tags:** print-quality, creality-ender-3
> **Comments:**
> **username_1**: Try calibrating again it E steps and, if it doesn't help, try reducing the extrusion multiplier by 1-2%  
> **username_0**: @FarO I have calibrated e steps and flow rate from E3Ds guide. I tried 95% and 98% extrusion but it made it more more prominent. My current extrusion multiplier is 99.3%  
> **username_1**: However you see that the excessive extrusion happens only near the edges, where there is deceleration. Are you sure the linear advance calibration is correct?  
> **username_0**: In the calibration test, there is a bump but its the best compared to the others. I will do another test without LA and check the difference.  
> **username_0**: There is no difference.just the corners are more bumpy  
> **username_2**: Sigh... I am running into exactly the same issue. Whenever the layer changes to a new shape, there is a clear line. Have no idea how to get rid of it... Did you remove it eventually?  
> **username_0**: @YuxiangWang Yes, I have, I have posted the solution for my particular case.  

---

## 1 answers

### Answer by username_0 on 2021-02-16. Score: 3 | Accepted answer

I have found the issue. My extruder gear was deformed after 4 months of continuous use which made the extruder have a difficult time when a rapid change in extrusion happened. I swapped it out to a new stainless steel one and it has been working well so far.

EDIT:

These inconsistencies are mainly caused by the pressure in the nozzle not changing fast enough. So to solve this you should look at the extruder setup as that is where the pressure is being controlled. Get any gunk out of there and make sure the path is clear and make sure nothing is grinding and you have a good grip on the filament.

To reduce the change in pressure you should play with printing speed, hotend temperature, linear advance if applicable and you may tune extruder jerk and acceleration although not necessary.

> **Comments:**
> **username_2**: Thank you! I did the same thing (I was already using aluminum extruder and switched to BMG) and it improved slightly. I found another person having similar issues and I think he was pointing to the same thing - sudden changes in extrusion totally caused it: https://www.reddit.com/r/3Dprinting/comments/ag1xq5/horizontal_lines_on_material_densitygeometry/  
> **username_2**: My next step will be switching to direct feed. Will update once I have it :)  

---

