<p>I initially tightened the tensioner for the x-axis belt pulley, which seemed to help. Then I double-checked my installation, and realized the belt for the x-axis was on upside down (belt teeth go in, smooth side of belt out).</p>
<p>So I guess it’s actually more surprising it’s been working well until now...</p>

CC BY-SA 4.0
2021-01-05T04:17:37.190Z
I guess that means it was also an X-axis layer shift, not a Y-axis one.
R.. GitHub STOP HELPING ICE
CC BY-SA 4.0
2021-01-06T14:43:03.160Z
Yes, sorry, 3D-printing newb (obviously). "Never believe what the user tells you", right? ;)
dlehman
CC BY-SA 4.0
2021-01-05T00:43:29.800Z
2021-01-05T00:43:29.800Z
dlehman
<p>I have an issue with a Y-shift every few lines <strong>only</strong> when printing multiple items at once. If I print the <em>exact same models</em> individually, they each print fine. Notice the shift only happens a few times, about every 4 lines, and then stops happening.</p>
<p>I’m printing PLA on an Ender 3 Pro, slicing with Cura 4.8 (Mac).</p>
<p>Any ideas on how to troubleshoot?</p>
<p><a href="https://i.sstatic.net/bLrf7.jpg" rel="nofollow noreferrer" title="Annotated image of both multiple and single prints"><img src="https://i.sstatic.net/bLrf7.jpg" alt="Annotated image of both multiple and single prints" title="Annotated image of both multiple and single prints" /></a>
<a href="https://i.sstatic.net/Uv2PZ.jpg" rel="nofollow noreferrer" title="Failed print on bed"><img src="https://i.sstatic.net/Uv2PZ.jpg" alt="Failed print on bed" title="Failed print on bed" /></a>
<a href="https://i.sstatic.net/cOq7r.jpg" rel="nofollow noreferrer" title="Two towers showing Y-shift"><img src="https://i.sstatic.net/cOq7r.jpg" alt="Two towers showing Y-shift" title="Two towers showing Y-shift" /></a>
<a href="https://i.sstatic.net/odYrB.jpg" rel="nofollow noreferrer" title="Closeup of failed print showing layering"><img src="https://i.sstatic.net/odYrB.jpg" alt="Closeup of failed print showing layering" title="Closeup of failed print showing layering" /></a></p>

CC BY-SA 4.0
2021-01-03T23:49:20.577Z
have you tried printing the part rotated by 90° around Z? I suspect it is a mechanical thing, the nozzle getting *snatched* by the print in a hole as it moves....
Trish
CC BY-SA 4.0
2021-01-04T00:04:49.450Z
I suspected a mechanical problem as well, perhaps a loose grub screw on a shaft.
fred_dot_u
CC BY-SA 4.0
2021-01-04T04:59:32.433Z
I will check these items; thanks for the suggestions.
dlehman
<creality-ender-3><pla>
Intermittent Y-shift print issue only with multiple items
dlehman
# Intermittent Y-shift print issue only with multiple items

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

I have an issue with a Y-shift every few lines **only** when printing multiple items at once. If I print the *exact same models* individually, they each print fine. Notice the shift only happens a few times, about every 4 lines, and then stops happening.

I’m printing PLA on an Ender 3 Pro, slicing with Cura 4.8 (Mac).

Any ideas on how to troubleshoot?

[![Annotated image of both multiple and single prints](https://i.sstatic.net/bLrf7.jpg "Annotated image of both multiple and single prints")](https://i.sstatic.net/bLrf7.jpg "Annotated image of both multiple and single prints")
[![Failed print on bed](https://i.sstatic.net/Uv2PZ.jpg "Failed print on bed")](https://i.sstatic.net/Uv2PZ.jpg "Failed print on bed")
[![Two towers showing Y-shift](https://i.sstatic.net/cOq7r.jpg "Two towers showing Y-shift")](https://i.sstatic.net/cOq7r.jpg "Two towers showing Y-shift")
[![Closeup of failed print showing layering](https://i.sstatic.net/odYrB.jpg "Closeup of failed print showing layering")](https://i.sstatic.net/odYrB.jpg "Closeup of failed print showing layering")

**Tags:** creality-ender-3, pla
> **Comments:**
> **username_1**: have you tried printing the part rotated by 90° around Z? I suspect it is a mechanical thing, the nozzle getting *snatched* by the print in a hole as it moves....  
> **username_2**: I suspected a mechanical problem as well, perhaps a loose grub screw on a shaft.  
> **username_0**: I will check these items; thanks for the suggestions.  

---

## 1 answers

### Answer by username_0 on 2021-01-05. Score: 3

I initially tightened the tensioner for the x-axis belt pulley, which seemed to help. Then I double-checked my installation, and realized the belt for the x-axis was on upside down (belt teeth go in, smooth side of belt out).

So I guess it’s actually more surprising it’s been working well until now...

> **Comments:**
> **username_3**: I guess that means it was also an X-axis layer shift, not a Y-axis one.  
> **username_0**: Yes, sorry, 3D-printing newb (obviously). "Never believe what the user tells you", right? ;)  

---

