<p>You are probably over extruding, this causes an excess amount of filament causing the mentioned problems. PETG is softer than PLA, so the extruder teeth grip deeper into the filament. This smaller diameter causes too much filament flow. Try to decrease the flow modifier for this spool of PETG.</p>
<p>Furthermore, your spool may have picked up some moisture, please dry the spool prior to use.</p>

CC BY-SA 4.0
2022-04-06T21:39:37.173Z
2023-02-08T12:07:29.483Z
2023-02-08T12:07:29.483Z
0scar
<p>Go a little warmer. Maybe 242.</p>
<p>Also, that 6 mm retraction number looks okay if you have a Bowden setup, but it's way too high if you don't (1.5 is a better starting number).</p>
<p>Finally, there are those who disagree on this point, but I only change my extrusion from the default 100% when I notice issues on specific prints. Ultimately, the extra 6% extruded material has to go <em>somewhere</em>, and it's likely contributing to the roughness.</p>

CC BY-SA 4.0
2022-09-09T14:17:43.033Z
2022-09-09T14:17:43.033Z
Joel Coehoorn
<p>I own a spool of PETG and I have been having major print quality issues: layer offsets, chunks of 3D print strewn across the buildplate and other things. I traced these effects to a single culprit: rough layers. I don't know how to fix this. I haven't had this issue at all with any of my other PETG filament colors. And the buildplate height is just where it needs to be, so why is this happening?</p>
<h3>Print settings</h3>
<ul>
<li>Layer height: 0.23 mm</li>
<li>Extruder: 235 °C</li>
<li>Bed: 80 °C</li>
<li>Retraction length: 6 mm</li>
<li>Retraction extra restart length: 0.3 mm</li>
<li>Z-Hop height: 0.25 mm</li>
<li>Base print speed: 45 mm/s</li>
<li>Extrusion ratio: 106 %</li>
</ul>

CC BY-SA 4.0
2022-04-07T03:25:14.743Z
What slicer are you using? Do you have "combing" enabled?
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2022-04-08T18:15:39.743Z
I am using Flash print. I dont know where to find "combing in my print settings" @R..GitHubSTOPHELPINGICE
X Builder
CC BY-SA 4.0
2022-09-09T14:14:49.910Z
Go a little warmer. Maybe 242. Also, that retraction number looks okay if you have a bowden setup, but it's way too high if you don't (1.5 is a better starting number)
Joel Coehoorn
CC BY-SA 4.0
2022-09-10T22:19:29.830Z
Do you have a picture you could add?
Tiztrain
<petg><layer-shifting>
PETG layers are super rough
X Builder
# PETG layers are super rough

(Asked by: username_0 on 2022-04-06)

I own a spool of PETG and I have been having major print quality issues: layer offsets, chunks of 3D print strewn across the buildplate and other things. I traced these effects to a single culprit: rough layers. I don't know how to fix this. I haven't had this issue at all with any of my other PETG filament colors. And the buildplate height is just where it needs to be, so why is this happening?

### Print settings

* Layer height: 0.23 mm
* Extruder: 235 °C
* Bed: 80 °C
* Retraction length: 6 mm
* Retraction extra restart length: 0.3 mm
* Z-Hop height: 0.25 mm
* Base print speed: 45 mm/s
* Extrusion ratio: 106 %

**Tags:** petg, layer-shifting
> **Comments:**
> **username_1**: What slicer are you using? Do you have "combing" enabled?  
> **username_0**: I am using Flash print. I dont know where to find "combing in my print settings" @R..GitHubSTOPHELPINGICE  
> **username_2**: Go a little warmer. Maybe 242. Also, that retraction number looks okay if you have a bowden setup, but it's way too high if you don't (1.5 is a better starting number)  
> **username_3**: Do you have a picture you could add?  

---

## 2 answers

### Answer by username_4 on 2022-04-06. Score: 1

You are probably over extruding, this causes an excess amount of filament causing the mentioned problems. PETG is softer than PLA, so the extruder teeth grip deeper into the filament. This smaller diameter causes too much filament flow. Try to decrease the flow modifier for this spool of PETG.

Furthermore, your spool may have picked up some moisture, please dry the spool prior to use.


---

### Answer by username_2 on 2022-09-09. Score: 0

Go a little warmer. Maybe 242.

Also, that 6 mm retraction number looks okay if you have a Bowden setup, but it's way too high if you don't (1.5 is a better starting number).

Finally, there are those who disagree on this point, but I only change my extrusion from the default 100% when I notice issues on specific prints. Ultimately, the extra 6% extruded material has to go *somewhere*, and it's likely contributing to the roughness.


---

