<p>I found the solution :
It was the option &quot;avoid crossing perimeters&quot; that seems to do exactly the contrary of what it means.
Thank you all for your answers.</p>

CC BY-SA 4.0
2020-10-13T19:21:17.680Z
you should approve your answer!
FarO
CC BY-SA 4.0
2020-10-13T15:59:21.780Z
2020-10-13T15:59:21.780Z
Antoine Artillan
<p>In PrusaSlicer 2.0, use the Filament Settings Tab, Filament Overrides entry.</p>
<p><a href="https://i.sstatic.net/lxXYU.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/lxXYU.png" alt="Slicer settings" /></a></p>
<p>Look for Lift Z, click the box, enter a suitable figure. 0.2 is a good place to start. You can raise it if needed, lower it to decrease (minimally) the overall print time.</p>

CC BY-SA 4.0
2020-10-13T08:10:53.283Z
Stringing should not be there in the first place... retraction maybe helps more?
FarO
CC BY-SA 4.0
2020-10-12T15:59:22.967Z
2020-10-12T15:59:22.967Z
fred_dot_u
<p>Enable Z-Hop. I don't know what the actual parameter is called but it should say something like &quot;Z-Hop&quot;.</p>

CC BY-SA 4.0
2020-10-12T12:05:43.003Z
2020-10-12T12:05:43.003Z
user77232
<p>I love PrusaSlicer but I am having a problem.
As you can see in the picture the head makes movements that seem useless<a href="https://i.sstatic.net/1CLrS.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/1CLrS.png" alt="Previsualisation" /></a></p>
<p>(blue lines that come out of the print in the corners and go back instantly in the object) and these make damages to the object during the print.</p>
<p><a href="https://i.sstatic.net/UOA3y.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/UOA3y.jpg" alt="During the print" /></a></p>
<p>How to configure PrusaSlicer so that doesn't happen again ?
Thank you.</p>
<p>Edit : Thank you for your answers but I think we have a misunderstanding. I already have z-hop activated, the real problem is that the slicer makes the head move outside the print (that's what you can see on the first screenshot, every blue line crossing the print shouldn't exist).
I actually don't have this problem with curaengine on repetierhost as you can see in the following screenshot :</p>
<p><a href="https://i.sstatic.net/c0b73.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/c0b73.png" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2020-10-13T14:26:09.063Z
Try https://github.com/supermerill/SuperSlicer maybe it has implemented a different algorithm.
FarO
CC BY-SA 4.0
2020-10-13T16:02:04.917Z
@FarO I found the solution but thank you for the link ! This fork seems very interesting (eg: it implements top surface ironing that works so well in curaengine)
Antoine Artillan
<slic3r><prusaslicer>
Useless head movements in PrusaSlicer
Antoine Artillan
# Useless head movements in PrusaSlicer

(Asked by: username_0 on 2020-10-12)

I love PrusaSlicer but I am having a problem.
As you can see in the picture the head makes movements that seem useless[![Previsualisation](https://i.sstatic.net/1CLrS.png)](https://i.sstatic.net/1CLrS.png)

(blue lines that come out of the print in the corners and go back instantly in the object) and these make damages to the object during the print.

[![During the print](https://i.sstatic.net/UOA3y.jpg)](https://i.sstatic.net/UOA3y.jpg)

How to configure PrusaSlicer so that doesn't happen again ?
Thank you.

Edit : Thank you for your answers but I think we have a misunderstanding. I already have z-hop activated, the real problem is that the slicer makes the head move outside the print (that's what you can see on the first screenshot, every blue line crossing the print shouldn't exist).
I actually don't have this problem with curaengine on repetierhost as you can see in the following screenshot :

[![enter image description here](https://i.sstatic.net/c0b73.png)](https://i.sstatic.net/c0b73.png)

**Tags:** slic3r, prusaslicer
> **Comments:**
> **username_1**: Try https://github.com/supermerill/SuperSlicer maybe it has implemented a different algorithm.  
> **username_0**: @FarO I found the solution but thank you for the link ! This fork seems very interesting (eg: it implements top surface ironing that works so well in curaengine)  

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## 3 answers

### Answer by username_0 on 2020-10-13. Score: 2 | Accepted answer

I found the solution :
It was the option "avoid crossing perimeters" that seems to do exactly the contrary of what it means.
Thank you all for your answers.

> **Comments:**
> **username_1**: you should approve your answer!  

---

### Answer by username_2 on 2020-10-12. Score: 0

In PrusaSlicer 2.0, use the Filament Settings Tab, Filament Overrides entry.

[![Slicer settings](https://i.sstatic.net/lxXYU.png)](https://i.sstatic.net/lxXYU.png)

Look for Lift Z, click the box, enter a suitable figure. 0.2 is a good place to start. You can raise it if needed, lower it to decrease (minimally) the overall print time.

> **Comments:**
> **username_1**: Stringing should not be there in the first place... retraction maybe helps more?  

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### Answer by username_3 on 2020-10-12. Score: 0

Enable Z-Hop. I don't know what the actual parameter is called but it should say something like "Z-Hop".


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