<p>It looks like you have a clogged nozzle/hot end. I use 225°C @ 40mm/s for PETG with 235°C @ 30mm/s for the first layer.</p>

<p>If you print at 245°C, you risk burning the PTFE liner in your hot end. You really need an all-metal hot end to print at such temperatures.</p>

<p>It is possible that you have already damaged the PTFE liner, and this may be the cause of your problem. However, I would check for a clogged nozzle first.</p>

CC BY-SA 3.0
2017-11-12T15:56:34.867Z
2017-11-12T17:25:11.947Z
2017-11-12T17:25:11.947Z
Mick
<p>I use the Cura; nylon default(recommended) settings for PETG. Upon my filament's box is written 200-240 for nozzle and 75-85 for bed. So I tried 245/80 - 220/80 - 220/60 - 245/60.</p>

<p>But I got same result as you can see in the pics:</p>

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

<p><a href="https://i.sstatic.net/J3CVi.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/J3CVi.jpg" alt="enter image description here"></a></p>

<p>My printer is PrusaI3 (actually a chinese kit that I assembled it myself). Also I had good print results with PLA before this. I was using 190/50 for PLA).</p>

CC BY-SA 3.0
2017-11-13T03:05:56.243Z
Good question.  I see signs of uneven extrusion (blobbiness), or perhaps bad bed adhesion, but it is hard to tell from the pictures.  Is there one full, even layer (I see a nice smooth coloration around the print)?
cmm
CC BY-SA 3.0
2017-11-13T05:17:02.933Z
@cmm: the support layers are very nice and smooth but the problem is about center layers. I will change the Teflon today and hope it will solve.
WDR
CC BY-SA 3.0
2017-11-14T02:21:57.290Z
Have you had this result more than once, or only this one time?  @Mick answer is pretty likely if this is the first and only time.  If you've reproduced this more than once, the problem could be elsewhere.  Do you have a direct-drive extruder or Bowden?  If direct drive, you might be heating the drive wheel so that the grip is not strong enough.
cmm
<prusa-i3>
It seems my filament is burnt when I use PETG
WDR
# It seems my filament is burnt when I use PETG

(Asked by: username_0 on 2017-11-12)

I use the Cura; nylon default(recommended) settings for PETG. Upon my filament's box is written 200-240 for nozzle and 75-85 for bed. So I tried 245/80 - 220/80 - 220/60 - 245/60.

But I got same result as you can see in the pics:

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

[![enter image description here](https://i.sstatic.net/J3CVi.jpg)](https://i.sstatic.net/J3CVi.jpg)

My printer is PrusaI3 (actually a chinese kit that I assembled it myself). Also I had good print results with PLA before this. I was using 190/50 for PLA).

**Tags:** prusa-i3

> **Comments:**
> **username_1**: Good question.  I see signs of uneven extrusion (blobbiness), or perhaps bad bed adhesion, but it is hard to tell from the pictures.  Is there one full, even layer (I see a nice smooth coloration around the print)?  
> **username_0**: @username_1: the support layers are very nice and smooth but the problem is about center layers. I will change the Teflon today and hope it will solve.  
> **username_1**: Have you had this result more than once, or only this one time?  @username_2 answer is pretty likely if this is the first and only time.  If you've reproduced this more than once, the problem could be elsewhere.  Do you have a direct-drive extruder or Bowden?  If direct drive, you might be heating the drive wheel so that the grip is not strong enough.  

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## 1 answers

### Answer by username_2 on 2017-11-12. Score: 0 | Accepted answer

It looks like you have a clogged nozzle/hot end. I use 225°C @ 40mm/s for PETG with 235°C @ 30mm/s for the first layer.

If you print at 245°C, you risk burning the PTFE liner in your hot end. You really need an all-metal hot end to print at such temperatures.

It is possible that you have already damaged the PTFE liner, and this may be the cause of your problem. However, I would check for a clogged nozzle first.


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