<p>So it looks like I finally resolved that issue. I compiled a complete new firmware based on the Marlin bugfix branch. Before I was working on the sources provided in the Bigtreetech GitHub. I started from scratch and put all the settings I needed into the Configuration.h and Configuration_adv.h. Now all rings are gone. Either there was really a bug or something or I messed up something in the firmware I used before and beginning from scratch solved it.</p>

CC BY-SA 4.0
2021-02-18T14:50:32.047Z
Since I cannot login into my other account I cannot mark this aswer as accepted solution.
zero695
CC BY-SA 4.0
2021-02-18T15:01:14.407Z
Hi Christian, many thanks for returning and posting an answer! Please note question "[How can one link / merge / combine / associate two accounts / users? (Anonymous / unregistered / cookie, or Google / Facebook / registered)](https://meta.stackexchange.com/questions/18232/how-can-one-link-merge-combine-associate-two-accounts-users-anonymous)" which directs to "[I accidentally created two accounts; how do I merge them?](https://meta.stackexchange.com/help/merging-accounts)" so you can fix this!
0scar
CC BY-SA 4.0
2021-02-18T15:03:49.290Z
Ah that's a shame, what happened to your previous login? As 0scar states, the accounts can be merged by the moderators, but it would be easier if you could just use your old account. Oh and thanks for updating the question with an answer, nice one, thanks :-)
Greenonline
CC BY-SA 4.0
2021-02-18T14:48:08.223Z
2021-02-18T14:48:08.223Z
zero695
<p>I'm currently facing a Z banding issue that frustrates me more and more.</p>
<p>My printer is a modified Anycubic I3 Mega.</p>
<p>Customizations:</p>
<ul>
<li>Mainboard: Bigtreetech SKR 1.4 Turbo</li>
<li>Stepper Drivers: TMC 2208 v3</li>
<li>Hotend: E3D Titan Aero</li>
<li>Hotbed: 5 mm aluminum base plate with a 200 W 12 V silicon heat mat and 3 mm hard paper as print base</li>
<li>External MOSFETs for the hotbed and hotend each</li>
<li>Bigtreetech 3.5 inch TFT screen as display</li>
<li>BL Touch sensor</li>
<li>Marlin version 2.0.6.1</li>
</ul>
<p>What I tried to fix this issue:</p>
<ul>
<li>check leadscrews for debris</li>
<li>cleaned leadscrews and applied new grease</li>
<li>checked Z couplers and hand tightened all screws</li>
<li>checked tightness of the Y/X axis belts</li>
<li>increased the driver current</li>
<li>replaced the 12 V 25 A PSU with a 12 V 30 A PSU</li>
<li>Extruder steps re-calibration</li>
<li>PID auto tune for hotend and bed</li>
</ul>
<p>Pictures of the XYZ calibration cubes I printed:</p>
<p><a href="https://i.sstatic.net/eA6jt.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/eA6jt.jpg" alt="enter image description here" /></a></p>
<p><a href="https://i.sstatic.net/8z0cA.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/8z0cA.jpg" alt="enter image description here" /></a></p>
<p>Used slicer parameters (Prusa Slicer):</p>
<ul>
<li>material: PETG</li>
<li>240 °C / 100 °C hotend/bed</li>
<li>Infill 30 % with 60 mm/s</li>
<li>outer perimeter with 30 mm/s</li>
<li>100 mm/s travel speed</li>
<li>1 mm retraction with 40 mm/s retraction speed</li>
</ul>
<p>The number of these horizontal lines and their occurrence is different on each print.</p>
<p>Any ideas?</p>

CC BY-SA 4.0
2021-02-16T13:46:14.797Z
Hi welcome to 3DPrinting.SE. It looks like your Z crew sometimes misses some steps. Did you measure the height of the calibration cubes.
0scar
CC BY-SA 4.0
2021-02-16T13:55:39.903Z
@0scar My calipers are not that exact but yes, it looks like its a litte bit too small. On my latest print I have 4 of those rings and it measures 19.4mm. During print it looks a lot like the z is not moving up for one layer resulting in printing the next layer on the same hight resulting in squishing the old layer which creates these rings.
zero695
CC BY-SA 4.0
2021-02-16T14:53:41.560Z
@0scar so what could possibly cause these missing steps?
zero695
CC BY-SA 4.0
2021-02-16T14:59:15.233Z
Are you sure the stepper drivers for the Z are correctly configured, enough current?
0scar
CC BY-SA 4.0
2021-02-16T19:03:29.377Z
Yes I am. The current ist set to X 860mA Y 860mA Z1 950mA Z2 950mA E 850mA.
M122 shows no errors or anything suspicious.
zero695
<troubleshooting><z-axis><petg><anycubic-i3-mega><bigtreetech>
Z banding issue
zero695
# Z banding issue

(Asked by: username_0 on 2021-02-16)

I'm currently facing a Z banding issue that frustrates me more and more.

My printer is a modified Anycubic I3 Mega.

Customizations:

* Mainboard: Bigtreetech SKR 1.4 Turbo
* Stepper Drivers: TMC 2208 v3
* Hotend: E3D Titan Aero
* Hotbed: 5 mm aluminum base plate with a 200 W 12 V silicon heat mat and 3 mm hard paper as print base
* External MOSFETs for the hotbed and hotend each
* Bigtreetech 3.5 inch TFT screen as display
* BL Touch sensor
* Marlin version 2.0.6.1

What I tried to fix this issue:

* check leadscrews for debris
* cleaned leadscrews and applied new grease
* checked Z couplers and hand tightened all screws
* checked tightness of the Y/X axis belts
* increased the driver current
* replaced the 12 V 25 A PSU with a 12 V 30 A PSU
* Extruder steps re-calibration
* PID auto tune for hotend and bed

Pictures of the XYZ calibration cubes I printed:

[![enter image description here](https://i.sstatic.net/eA6jt.jpg)](https://i.sstatic.net/eA6jt.jpg)

[![enter image description here](https://i.sstatic.net/8z0cA.jpg)](https://i.sstatic.net/8z0cA.jpg)

Used slicer parameters (Prusa Slicer):

* material: PETG
* 240 °C / 100 °C hotend/bed
* Infill 30 % with 60 mm/s
* outer perimeter with 30 mm/s
* 100 mm/s travel speed
* 1 mm retraction with 40 mm/s retraction speed

The number of these horizontal lines and their occurrence is different on each print.

Any ideas?

**Tags:** troubleshooting, z-axis, petg, anycubic-i3-mega, bigtreetech
> **Comments:**
> **username_1**: Hi welcome to 3DPrinting.SE. It looks like your Z crew sometimes misses some steps. Did you measure the height of the calibration cubes.  
> **username_0**: @0scar My calipers are not that exact but yes, it looks like its a litte bit too small. On my latest print I have 4 of those rings and it measures 19.4mm. During print it looks a lot like the z is not moving up for one layer resulting in printing the next layer on the same hight resulting in squishing the old layer which creates these rings.  
> **username_0**: @0scar so what could possibly cause these missing steps?  
> **username_1**: Are you sure the stepper drivers for the Z are correctly configured, enough current?  
> **username_0**: Yes I am. The current ist set to X 860mA Y 860mA Z1 950mA Z2 950mA E 850mA. M122 shows no errors or anything suspicious.  

---

## 1 answers

### Answer by username_0 on 2021-02-18. Score: 1 | Accepted answer

So it looks like I finally resolved that issue. I compiled a complete new firmware based on the Marlin bugfix branch. Before I was working on the sources provided in the Bigtreetech GitHub. I started from scratch and put all the settings I needed into the Configuration.h and Configuration\_adv.h. Now all rings are gone. Either there was really a bug or something or I messed up something in the firmware I used before and beginning from scratch solved it.

> **Comments:**
> **username_0**: Since I cannot login into my other account I cannot mark this aswer as accepted solution.  
> **username_1**: Hi Christian, many thanks for returning and posting an answer! Please note question "[How can one link / merge / combine / associate two accounts / users? (Anonymous / unregistered / cookie, or Google / Facebook / registered)](https://meta.stackexchange.com/questions/18232/how-can-one-link-merge-combine-associate-two-accounts-users-anonymous)" which directs to "[I accidentally created two accounts; how do I merge them?](https://meta.stackexchange.com/help/merging-accounts)" so you can fix this!  
> **username_2**: Ah that's a shame, what happened to your previous login? As 0scar states, the accounts can be merged by the moderators, but it would be easier if you could just use your old account. Oh and thanks for updating the question with an answer, nice one, thanks :-)  

---

