<p>I've had similar experiences switching from PLA to PETG, and haven't gotten it fully figured out yet.</p>

<p>From what I know so far, to reduce petg strings:</p>

<ul>
<li>Increase retraction</li>
<li>Lower temperature</li>
</ul>

CC BY-SA 3.0
2017-09-15T21:40:35.380Z
Thank you for your input.  I spoke to a friend at work, and he said that he saw online somewhere that what you need to do is to adjust your temperature until you can just push through the filament by hand.  He got good results printing at 250, whereas I was at 240 on a printer similar to mine.  However, he also said that the exact temperature varies from printer to printer and also each spool of PETG may be different.
Gdalya
CC BY-SA 3.0
2017-09-16T01:12:42.747Z
That sounds like good advice to me, thanks for sharing it!
ctag
CC BY-SA 3.0
2017-09-14T19:54:10.937Z
2017-09-14T19:54:10.937Z
ctag
<p>If you are using a printer that runs Marlin, you might consider upgrading to a version with Linear Advance. Once I started using Linear Advance, I reduced the stringing of PETG. 
Also I was able to reduce the retraction amount without reducing the quality of the prints.</p>

CC BY-SA 3.0
2017-10-16T23:52:23.000Z
Thank you.  How do I tell if my printer runs Marlin?
Gdalya
CC BY-SA 3.0
2017-10-17T00:13:51.280Z
well , what printer do you have ?
Kotiq
CC BY-SA 3.0
2017-10-17T00:15:40.933Z
Keep in mind that Linear Advance was added this year in the Marlin firmware .
I also did a temperature tower print , and ended up lowering by 10 degrees the print temperature. You can start by doing that , before you start changing the firmware on the printer :)
Kotiq
CC BY-SA 3.0
2017-10-16T07:31:54.170Z
2017-10-16T07:31:54.170Z
Kotiq
<p>I have started printing with PETG so I can create objects that won't deform if I leave them in my car.</p>

<p>My first prints look good, but have strings of material coming off the print in places.</p>

<p>What should I try to prevent that? </p>

<p>I haven't had this problem with PLA. </p>

CC BY-SA 3.0
2017-08-21T13:16:42.703Z
Can you attach an image?
Davo
CC BY-SA 3.0
2017-10-15T21:28:38.533Z
I know PETG by nature strings a bit.  You may want to increase the temperature in the room, or add an enclosure.  I think when the hot end pulls away from the piece, the material is instantly hardening causing the stringiness, maybe increasing the environmental temperature will allow the filament to release from the work piece before it hardens into a stringy mess.
ctilley79
CC BY-SA 3.0
2017-10-16T23:55:15.750Z
Would turning off the fan that cools the filament (not the print head) accomplish the same goal of slowing down the hardening of the PETG?
Gdalya
<pet>
Stringy PETG prints
Gdalya
# Stringy PETG prints

(Asked by: username_0 on 2017-08-21)

I have started printing with PETG so I can create objects that won't deform if I leave them in my car.

My first prints look good, but have strings of material coming off the print in places.

What should I try to prevent that?

I haven't had this problem with PLA.

**Tags:** pet

> **Comments:**
> **username_1**: Can you attach an image?  
> **username_2**: I know PETG by nature strings a bit.  You may want to increase the temperature in the room, or add an enclosure.  I think when the hot end pulls away from the piece, the material is instantly hardening causing the stringiness, maybe increasing the environmental temperature will allow the filament to release from the work piece before it hardens into a stringy mess.  
> **username_0**: Would turning off the fan that cools the filament (not the print head) accomplish the same goal of slowing down the hardening of the PETG?  

---

## 2 answers

### Answer by username_3 on 2017-09-14. Score: 3

I've had similar experiences switching from PLA to PETG, and haven't gotten it fully figured out yet.

From what I know so far, to reduce petg strings:

* Increase retraction
* Lower temperature

> **Comments:**
> **username_0**: Thank you for your input.  I spoke to a friend at work, and he said that he saw online somewhere that what you need to do is to adjust your temperature until you can just push through the filament by hand.  He got good results printing at 250, whereas I was at 240 on a printer similar to mine.  However, he also said that the exact temperature varies from printer to printer and also each spool of PETG may be different.  
> **username_3**: That sounds like good advice to me, thanks for sharing it!  

---

### Answer by username_4 on 2017-10-16. Score: 2

If you are using a printer that runs Marlin, you might consider upgrading to a version with Linear Advance. Once I started using Linear Advance, I reduced the stringing of PETG.
Also I was able to reduce the retraction amount without reducing the quality of the prints.

> **Comments:**
> **username_0**: Thank you.  How do I tell if my printer runs Marlin?  
> **username_4**: well , what printer do you have ?  
> **username_4**: Keep in mind that Linear Advance was added this year in the Marlin firmware . I also did a temperature tower print , and ended up lowering by 10 degrees the print temperature. You can start by doing that , before you start changing the firmware on the printer :)  

---

