<p>I've had five Creality K1C CoreXY 3D printers for about four months. Recently, one of them started having issues where the printed holes aren't coming out as circles and the parts aren't accurate. I'm using the <strong>same G-code</strong> that works perfectly on my other K1C printers, where the holes print as they should. I've attached some pictures for comparison. I haven't found anyone with a similar issue yet, so any help is appreciated. If you think a calibration model would help diagnose the issue, feel free to suggest one and I'll print it. I'll send you pictures of the results.</p>
<p>What I have tried:</p>
<ol>
<li>Tensioned the belt by following <a href="https://www.youtube.com/watch?v=dciz77YTRHQ" rel="nofollow noreferrer">K1 Belt Tension ... How To Creality K1</a>.</li>
<li>Greased the Z-axis lead screw.</li>
<li>Greased the X-axis rod.</li>
</ol>
<p><img src="https://i.sstatic.net/rSJx3ekZ.jpg" alt="A portion of a 3D printed model showing an oval opening that should be circular" title="A portion of a 3D printed model showing an oval opening that should be circular" /></p>
<p><img src="https://i.sstatic.net/ZLOah1Am.jpg" alt="Photo of a complete 3D printed model with 5 oval openings" title="Photo of a complete 3D printed model with 5 oval openings" /></p>
<p><img src="https://i.sstatic.net/Jf3wL3n2.jpg" alt="Photo of two 3D printed models a peach-colored model with its holes circular and a white model with its holes oval" title="Photo of two 3D printed models a peach-colored model with its holes circular and a white model with its holes oval" /></p>
<p><img src="https://i.sstatic.net/CRYQsTrk.jpg" alt="calibrate cube 40mm x side" />
<img src="https://i.sstatic.net/oTb46X4A.jpg" alt="calibrate cube 40mm y side" />
<img src="https://i.sstatic.net/oTNmhBGA.jpg" alt="calibrate cube 40mm z side" /></p>

CC BY-SA 4.0
2024-10-06T21:29:10.633Z
The white one is also terribly underextruding... There are more problems than only oval holes! Have you seen [3d printer not printing circles correctly](https://3dprinting.stackexchange.com/questions/4619/3d-printer-not-printing-circles-correctly)?
0scar
CC BY-SA 4.0
2024-10-07T01:04:10.663Z
I will check the solution provided in that link and update you on how it works out.
cadz
CC BY-SA 4.0
2024-10-07T04:55:16.437Z
after I tried calibrate the rotation distance and also tighten the belt the result is still the same, the only I haven't try is check for the slipping pulley. (I don't know how to fix a slipping pulley)
cadz
CC BY-SA 4.0
2024-10-07T17:44:25.653Z
Your latest added calibration cube Z top layers photo still look awful. Seriously underextruding! But the developers of the cube did even worse than your printer does! See [calibration cube](https://www.thingiverse.com/thing:1278865) on Thingiverse.
0scar
CC BY-SA 4.0
2024-10-08T10:39:28.637Z
I tried cleaning the nozzle and also change the filament to a new one and result is still the same.
cadz
CC BY-SA 4.0
2024-10-08T14:35:04.147Z
Good, now you know where to focus! The extruder.
0scar
CC BY-SA 4.0
2024-10-09T02:29:43.540Z
do you have a guide or document for trouble shooting an extruder?
cadz
<troubleshooting><creality><klipper><dimensional-accuracy><corexy>
Creality K1C printing holes as ovals not circles
cadz
# Creality K1C printing holes as ovals not circles

(Asked by: username_0 on 2024-10-06)

I've had five Creality K1C CoreXY 3D printers for about four months. Recently, one of them started having issues where the printed holes aren't coming out as circles and the parts aren't accurate. I'm using the **same G-code** that works perfectly on my other K1C printers, where the holes print as they should. I've attached some pictures for comparison. I haven't found anyone with a similar issue yet, so any help is appreciated. If you think a calibration model would help diagnose the issue, feel free to suggest one and I'll print it. I'll send you pictures of the results.

What I have tried:

1. Tensioned the belt by following [K1 Belt Tension ... How To Creality K1](https://www.youtube.com/watch?v=dciz77YTRHQ).
2. Greased the Z-axis lead screw.
3. Greased the X-axis rod.

![A portion of a 3D printed model showing an oval opening that should be circular](https://i.sstatic.net/rSJx3ekZ.jpg "A portion of a 3D printed model showing an oval opening that should be circular")

![Photo of a complete 3D printed model with 5 oval openings](https://i.sstatic.net/ZLOah1Am.jpg "Photo of a complete 3D printed model with 5 oval openings")

![Photo of two 3D printed models a peach-colored model with its holes circular and a white model with its holes oval](https://i.sstatic.net/Jf3wL3n2.jpg "Photo of two 3D printed models a peach-colored model with its holes circular and a white model with its holes oval")

![calibrate cube 40mm x side](https://i.sstatic.net/CRYQsTrk.jpg)
![calibrate cube 40mm y side](https://i.sstatic.net/oTb46X4A.jpg)
![calibrate cube 40mm z side](https://i.sstatic.net/oTNmhBGA.jpg)

**Tags:** troubleshooting, creality, klipper, dimensional-accuracy, corexy
> **Comments:**
> **username_1**: The white one is also terribly underextruding... There are more problems than only oval holes! Have you seen [3d printer not printing circles correctly](https://3dprinting.stackexchange.com/questions/4619/3d-printer-not-printing-circles-correctly)?  
> **username_0**: I will check the solution provided in that link and update you on how it works out.  
> **username_0**: after I tried calibrate the rotation distance and also tighten the belt the result is still the same, the only I haven't try is check for the slipping pulley. (I don't know how to fix a slipping pulley)  
> **username_1**: Your latest added calibration cube Z top layers photo still look awful. Seriously underextruding! But the developers of the cube did even worse than your printer does! See [calibration cube](https://www.thingiverse.com/thing:1278865) on Thingiverse.  
> **username_0**: I tried cleaning the nozzle and also change the filament to a new one and result is still the same.  
> **username_1**: Good, now you know where to focus! The extruder.  
> **username_0**: do you have a guide or document for trouble shooting an extruder?  

---

## 0 answers

