<ul>
<li>Printer: Anycubic Mega S.</li>
<li>Mods: BLTouch, Dual material with G-code-powered switch.</li>
<li>Firmware: Marlin 2.0</li>
</ul>
<p>A couple of weeks ago I had a print failure when printing PETG. Now whenever I use auto bed leveling, it doesn't compensate correctly. The nozzles will be too high on the left side of the bed, and too low toward the right. I checked my firmware configuration, and everything appears to be OK. I also suspect that the failed print may have knocked the Z endstops out of alignment.</p>
<p>I recalibrated the Z-offset on the BLTouch and ran a probe repeatability test. Everything came out fine. My <code>Configuration.h</code> can be found <a href="https://www.dropbox.com/sh/ccp6dzft8mo2h1j/AAD7-gjMG4wRQvafq-cwiFPUa?dl=0" rel="nofollow noreferrer">here</a>. As well as a picture of the hotend setup below.</p>
<p>Edit: I tried leveling the bed manually before using ABL. Still had the same problem.</p>
<p>Edit 2: I looked more closely at the bed leveling logs and noticed that it is reading the bed level incorrectly, contrary to my previous tests.
I do not know what this means, but I suspect it has to do with misaligned endstops. Could this be correct?</p>
<p><a href="https://i.sstatic.net/9zbK2.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/9zbK2.jpg" alt="My dual nozzle/material mod for the Anycubic I3 Mega/Mega S" /></a></p>

CC BY-SA 4.0
2021-03-21T16:38:50.817Z
Are your nozzles perfectly level? What you're describing sounds like they aren't.
Rykara
CC BY-SA 4.0
2021-03-22T16:13:20.090Z
@Rykara, you are correct, the nozzles were misaligned. I releveled them, but the original problem still lingers.
Auri M
CC BY-SA 4.0
2021-04-02T21:34:38.180Z
You think one Z axis might be slightly higher than the other? Have you aligned them to the same height like in [this video](https://www.youtube.com/watch?v=6QhUgq4C008)?
Rykara
CC BY-SA 4.0
2021-04-10T21:31:19.653Z
Alright, I tried re-aligning the Z axis a couple times. It didn’t solve the problem. However, the distance from the bed to the nozzle at each side changed slightly (w/ auto leveling active).
Auri M
<marlin><bltouch><anycubic-i3-mega>
BLTouch does not compensate for bed level correctly
Auri M
# BLTouch does not compensate for bed level correctly

(Asked by: username_0 on 2021-03-20)

* Printer: Anycubic Mega S.
* Mods: BLTouch, Dual material with G-code-powered switch.
* Firmware: Marlin 2.0

A couple of weeks ago I had a print failure when printing PETG. Now whenever I use auto bed leveling, it doesn't compensate correctly. The nozzles will be too high on the left side of the bed, and too low toward the right. I checked my firmware configuration, and everything appears to be OK. I also suspect that the failed print may have knocked the Z endstops out of alignment.

I recalibrated the Z-offset on the BLTouch and ran a probe repeatability test. Everything came out fine. My `Configuration.h` can be found [here](https://www.dropbox.com/sh/ccp6dzft8mo2h1j/AAD7-gjMG4wRQvafq-cwiFPUa?dl=0). As well as a picture of the hotend setup below.

Edit: I tried leveling the bed manually before using ABL. Still had the same problem.

Edit 2: I looked more closely at the bed leveling logs and noticed that it is reading the bed level incorrectly, contrary to my previous tests.
I do not know what this means, but I suspect it has to do with misaligned endstops. Could this be correct?

[![My dual nozzle/material mod for the Anycubic I3 Mega/Mega S](https://i.sstatic.net/9zbK2.jpg)](https://i.sstatic.net/9zbK2.jpg)

**Tags:** marlin, bltouch, anycubic-i3-mega

> **Comments:**
> **username_1**: Are your nozzles perfectly level? What you're describing sounds like they aren't.  
> **username_0**: @username_1, you are correct, the nozzles were misaligned. I releveled them, but the original problem still lingers.  
> **username_1**: You think one Z axis might be slightly higher than the other? Have you aligned them to the same height like in [this video](https://www.youtube.com/watch?v=6QhUgq4C008)?  
> **username_0**: Alright, I tried re-aligning the Z axis a couple times. It didn’t solve the problem. However, the distance from the bed to the nozzle at each side changed slightly (w/ auto leveling active).  

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## 0 answers

