<p>The picture of the line types and the accompanying comment helps to clear this up:</p>
<blockquote>
<p>they are &quot;Travel&quot; lines, but why material is printed during travel?</p>
</blockquote>
<p>Yes, the dark blue is travel. But if material is deposited during them, then that is not <em>printing</em>, that is material oozing out of the nozzle - which is called stringing most often. Usually, this is an issue with retraction: your length is possibly a little short. However, retraction also only is turned on for moves over a given length, so there might be no retraction happening. And, in Cura support structure generally is printed without retraction due to toggle <code>Limit Support Retractions</code>. Toggling that off can help.</p>
<p>You might also turn on one of the two <em>Avoid</em> modes in the movement (<code>Avoid Printed Parts when Traveling</code> &amp; <code>Avoid Supports When Traveling</code>) to get the movement paths in a way so they don't go over the model and prevent any stringing/oozing onto it or knocking off delicate parts. Possibly increasing retraction a little might help, and so might <code>Z-hop</code> to try to &quot;rip&quot; the strings.</p>

CC BY-SA 4.0
2021-03-03T19:44:17.930Z
Then it is very strange, if material is oozing only in that area. Tried changing "Combing Mode" and nothing changed for those lines, but then tried to uncheck "Avoid Supports When Traveling" and travel lines disappeared over skin in that area. I remember when I printed with "Avoid Supports When Traveling" unchecked then nozzle hit supports.
Māris L
CC BY-SA 4.0
2021-03-03T21:19:12.240Z
@MārisL Have you tried "Avoid Printed Parts when traveling"?
Trish
CC BY-SA 4.0
2021-03-05T15:32:03.783Z
This is the answer, but you missed the biggest Cura options causing it. By default Cura does "Limit Support Retractions" which basically means "ooze uncontrollably all over the place while printing support". Turn that off and most of the problem should go away. Turning off the "Avoid ..." options should not be necessary, and only helps by reducing the length of the unretracted travel paths.
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2021-03-07T16:07:42.730Z
@Trish - yes, "Avoid Printed Parts When Traveling" is active.
Māris L
CC BY-SA 4.0
2021-03-07T16:15:23.040Z
@R.. GitHub STOP HELPING ICE when I turn off `Limit Support Retractions` and I turn on `Avoid Supports When Traveling`, then in preview I can see that nozzle again will travel over shell
Māris L
CC BY-SA 4.0
2021-03-07T23:06:33.433Z
@MārisL: It will still travel over it, but the travel will now be with the filament retracted so that it's not extruding material there as it moves.
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2021-03-03T19:10:28.560Z
2021-03-05T16:37:29.913Z
2021-03-05T16:37:29.913Z
Trish
<p>When I check the Cura preview, then there isn't support over the shell, but when the part is printed, then there is support over the shell and it makes it look ugly. It happens only for front and back but the left and right sides are without support over the shell.</p>
<p>When you open the .gcode file in Cura then you also can't see support over the shell.</p>
<p>What could cause this problem?</p>
<p><a href="https://i.sstatic.net/kRUyU.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/kRUyU.png" alt="enter image description here" /></a></p>
<p>Added view from &quot;Line Type&quot;
<a href="https://i.sstatic.net/tzUfz.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/tzUfz.png" alt="enter image description here" /></a></p>

CC BY-SA 4.0
2021-03-02T09:48:34.937Z
mind turning on the "type" of line?
Trish
CC BY-SA 4.0
2021-03-03T18:00:56.810Z
@Trish added view from "Line Type" and they are "Travel" lines, but why material is printed during travel?
Māris L
CC BY-SA 4.0
2021-03-03T19:02:59.227Z
Ahhhh! ok now I know what you mean!
Trish
<ultimaker-cura><support-structures>
Why is support printed over shell if layer preview doesn't show it?
Māris L
# Why is support printed over shell if layer preview doesn't show it?

(Asked by: username_0 on 2021-03-01)

When I check the Cura preview, then there isn't support over the shell, but when the part is printed, then there is support over the shell and it makes it look ugly. It happens only for front and back but the left and right sides are without support over the shell.

When you open the .gcode file in Cura then you also can't see support over the shell.

What could cause this problem?

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

Added view from "Line Type"
[![enter image description here](https://i.sstatic.net/tzUfz.png)](https://i.sstatic.net/tzUfz.png)

**Tags:** ultimaker-cura, support-structures
> **Comments:**
> **username_1**: mind turning on the "type" of line?  
> **username_0**: @Trish added view from "Line Type" and they are "Travel" lines, but why material is printed during travel?  
> **username_1**: Ahhhh! ok now I know what you mean!  

---

## 1 answers

### Answer by username_1 on 2021-03-03. Score: 1

The picture of the line types and the accompanying comment helps to clear this up:

> they are "Travel" lines, but why material is printed during travel?

Yes, the dark blue is travel. But if material is deposited during them, then that is not *printing*, that is material oozing out of the nozzle - which is called stringing most often. Usually, this is an issue with retraction: your length is possibly a little short. However, retraction also only is turned on for moves over a given length, so there might be no retraction happening. And, in Cura support structure generally is printed without retraction due to toggle `Limit Support Retractions`. Toggling that off can help.

You might also turn on one of the two *Avoid* modes in the movement (`Avoid Printed Parts when Traveling` & `Avoid Supports When Traveling`) to get the movement paths in a way so they don't go over the model and prevent any stringing/oozing onto it or knocking off delicate parts. Possibly increasing retraction a little might help, and so might `Z-hop` to try to "rip" the strings.

> **Comments:**
> **username_0**: Then it is very strange, if material is oozing only in that area. Tried changing "Combing Mode" and nothing changed for those lines, but then tried to uncheck "Avoid Supports When Traveling" and travel lines disappeared over skin in that area. I remember when I printed with "Avoid Supports When Traveling" unchecked then nozzle hit supports.  
> **username_1**: @MārisL Have you tried "Avoid Printed Parts when traveling"?  
> **username_2**: This is the answer, but you missed the biggest Cura options causing it. By default Cura does "Limit Support Retractions" which basically means "ooze uncontrollably all over the place while printing support". Turn that off and most of the problem should go away. Turning off the "Avoid ..." options should not be necessary, and only helps by reducing the length of the unretracted travel paths.  
> **username_0**: @Trish - yes, "Avoid Printed Parts When Traveling" is active.  
> **username_0**: @R.. GitHub STOP HELPING ICE when I turn off `Limit Support Retractions` and I turn on `Avoid Supports When Traveling`, then in preview I can see that nozzle again will travel over shell  
> **username_2**: @MārisL: It will still travel over it, but the travel will now be with the filament retracted so that it's not extruding material there as it moves.  

---

