<p>The wavy lay down on the first layer usually indicates one of two problems:</p>
<ul>
<li>The first layer is badly calibrated (too much distance, laying down in waves or too little, squeezing out in waves).</li>
<li>The plastic doesn't stick to the bed well enough.</li>
</ul>

CC BY-SA 4.0
2022-02-24T02:16:08.433Z
Thanks. Adding clearance solved the first layer issue. But there is still top layer quality issue on top layer. Please read my update.
aleung
CC BY-SA 4.0
2022-02-24T10:09:08.437Z
Top layer is a different question from bottom
Trish
CC BY-SA 4.0
2022-02-25T06:52:47.507Z
Yes I searched and found the top layer issue may be caused by Marlin firmware configuration. Removed from my question.
aleung
CC BY-SA 4.0
2022-02-22T21:57:35.363Z
2022-02-24T10:10:24.640Z
2022-02-24T10:10:24.640Z
Trish
<p>Every time I print a large area I get the pattern in the middle.</p>
<p><a href="https://i.sstatic.net/PfS6f.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/PfS6f.jpg" alt="pattern on first layer" /></a></p>
<p>Below picture was taken during printing. The material isn't evenly laid flat on the bed and some are being scraped up.</p>
<p>It appears from some centimeters away from the edge and extends perpendicular to the nozzle moving direction.</p>
<p><a href="https://i.sstatic.net/UoFFo.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/UoFFo.jpg" alt="during print" /></a></p>
<p>The pattern appears at the similar position when I print the same model again.</p>
<p>It's a delta printer. Print PETG on glass bed at 75 °C.</p>
<p><strong>Update</strong>:</p>
<p>After adjusting delta height to add clearance, the first layer is super clean without any wave.</p>

CC BY-SA 4.0
2022-02-22T18:27:14.727Z
This has been asked before, this is the start of the effect, with even closer nozzle to gap (paper distance) you might run into having [waves in the first layer](https://3dprinting.stackexchange.com/questions/7229/what-causes-ripples-on-part-of-first-layer). This is caused by too much flow in too less space, increase the nozzle to bed distance for Z=0.
0scar
CC BY-SA 4.0
2022-02-22T19:04:20.347Z
Have you tried lowering the print-head travel speed?  Do the "blobs" get shorter?
Criggie
<print-quality><petg><delta>
What cause the pattern in a large area?
aleung
# What cause the pattern in a large area?

(Asked by: username_0 on 2022-02-22)

Every time I print a large area I get the pattern in the middle.

[![pattern on first layer](https://i.sstatic.net/PfS6f.jpg)](https://i.sstatic.net/PfS6f.jpg)

Below picture was taken during printing. The material isn't evenly laid flat on the bed and some are being scraped up.

It appears from some centimeters away from the edge and extends perpendicular to the nozzle moving direction.

[![during print](https://i.sstatic.net/UoFFo.jpg)](https://i.sstatic.net/UoFFo.jpg)

The pattern appears at the similar position when I print the same model again.

It's a delta printer. Print PETG on glass bed at 75 °C.

**Update**:

After adjusting delta height to add clearance, the first layer is super clean without any wave.

**Tags:** print-quality, petg, delta
> **Comments:**
> **username_1**: This has been asked before, this is the start of the effect, with even closer nozzle to gap (paper distance) you might run into having [waves in the first layer](https://3dprinting.stackexchange.com/questions/7229/what-causes-ripples-on-part-of-first-layer). This is caused by too much flow in too less space, increase the nozzle to bed distance for Z=0.  
> **username_2**: Have you tried lowering the print-head travel speed?  Do the "blobs" get shorter?  

---

## 1 answers

### Answer by username_3 on 2022-02-22. Score: 1 | Accepted answer

The wavy lay down on the first layer usually indicates one of two problems:

* The first layer is badly calibrated (too much distance, laying down in waves or too little, squeezing out in waves).
* The plastic doesn't stick to the bed well enough.

> **Comments:**
> **username_0**: Thanks. Adding clearance solved the first layer issue. But there is still top layer quality issue on top layer. Please read my update.  
> **username_3**: Top layer is a different question from bottom  
> **username_0**: Yes I searched and found the top layer issue may be caused by Marlin firmware configuration. Removed from my question.  

---

