# SOLVED: Taz 6 auto leveling is \>0.5mm off (NOW PERFECT TO 0.01mm!)

**URL:** <https://forum.lulzbot.com/t/solved-taz-6-auto-leveling-is-0-5mm-off-now-perfect-to-0-01mm/6250>\
**Category:** LulzBot TAZ\
**Created:** [October 17, 2018, 9:25pm UTC](https://forum.lulzbot.com/t/solved-taz-6-auto-leveling-is-0-5mm-off-now-perfect-to-0-01mm/6250 "2018-10-17T21:25:56Z")\
**Posts on this page:** 1\
**Showing post:** 29

<div class="post-metadata">

**Author:** ![Hainjedaf](https://avatars.discourse-cdn.com/v4/letter/h/9dc877/32.png) [@Hainjedaf](https://forum.lulzbot.com/u/Hainjedaf)\
**Post date:** [July 8, 2021, 8:26pm UTC](https://forum.lulzbot.com/t/solved-taz-6-auto-leveling-is-0-5mm-off-now-perfect-to-0-01mm/6250/29 "2021-07-08T20:26:51Z")

</div>

Hi, my TAZ PRO and I’m tryng to understand this… please help, I know this is a newbie question.

I did the calibration sequences (backlash and nozzle offset)  
then I did the  
M420 S0  
G28  
G29 V4  
I did this several timens:

First:

```auto
Send: G28
Recv: echo:Active Extruder: 0
Recv: X:-21.96 Y:286.96 Z:290.00 E:0.00 Count X:-2200 Y:28700 Z:145000
Recv: ok P15 B4
Send: G29 V4
Recv: G29 Auto Bed Leveling
Recv: Bed X: -10.000 Y: -9.000 Z: 1.102
Recv: Bed X: 288.000 Y: -9.000 Z: 1.220
Recv: Bed X: 288.000 Y: 291.000 Z: 1.116
Recv: Bed X: -10.000 Y: 291.000 Z: 1.145
Recv: 4th probe point, distance from plane: 0.15
Recv: Eqn coefficients: a: 0.00014765 b: -0.00010133 d: 1.13936484
Recv: Mean of sampled points: 1.14560008
Recv: 
Recv: Bed Height Topography:
Recv: +--- BACK --+
Recv: | |
Recv: L | (+) | R
Recv: E | | I
Recv: F | (-) N (+) | G
Recv: T | | H
Recv: | (-) | T
Recv: | |
Recv: O-- FRONT --+
Recv: (0,0)
Recv: -0.00040 -0.03000
Recv: -0.04360 +0.07400
Recv: 
Recv: 
Recv: Corrected Bed Height vs. Bed Topology:
Recv: +0.07360 +0.00000
Recv: +0.00000 +0.07360
Recv: 
Recv: 
Recv: 
Recv: Bed Level Correction Matrix:
Recv: +1.000000 +0.000000 +0.000148
Recv: +0.000000 +1.000000 -0.000101
Recv: -0.000148 +0.000101 +1.000000
Recv: X:-10.00 Y:291.00 Z:6.22 E:0.00 Count X:-1000 Y:29100 Z:3110
Recv: echo:Unknown command: ""
Recv: ok P15 B4
```

second time:

```auto
Send: G28
Recv: echo:Active Extruder: 0
Recv: X:-21.96 Y:286.97 Z:290.00 E:0.00 Count X:-2200 Y:28700 Z:145000
Recv: ok P15 B4
Send: G29 V4
Recv: G29 Auto Bed Leveling
Recv: Bed X: -10.000 Y: -9.000 Z: 1.107
Recv: Bed X: 288.000 Y: -9.000 Z: 1.226
Recv: Bed X: 288.000 Y: 291.000 Z: 1.119
Recv: Bed X: -10.000 Y: 291.000 Z: 1.150
Recv: 4th probe point, distance from plane: 0.15
Recv: Eqn coefficients: a: 0.00014765 b: -0.00010667 d: 1.14491653
Recv: Mean of sampled points: 1.15040004
Recv: 
Recv: Bed Height Topography:
Recv: +--- BACK --+
Recv: | |
Recv: L | (+) | R
Recv: E | | I
Recv: F | (-) N (+) | G
Recv: T | | H
Recv: | (-) | T
Recv: | |
Recv: O-- FRONT --+
Recv: (0,0)
Recv: -0.00080 -0.03120
Recv: -0.04320 +0.07520
Recv: 
Recv: 
Recv: Corrected Bed Height vs. Bed Topology:
Recv: +0.07440 +0.00000
Recv: +0.00000 +0.07440
Recv: 
Recv: 
Recv: 
Recv: Bed Level Correction Matrix:
Recv: +1.000000 +0.000000 +0.000148
Recv: +0.000000 +1.000000 -0.000107
Recv: -0.000148 +0.000107 +1.000000
Recv: X:-10.00 Y:291.00 Z:6.22 E:0.00 Count X:-1000 Y:29100 Z:3111
Recv: echo:Unknown command: ""
Recv: ok P15 B4
```

How do I interpret this?  
What needs correcting?  
how?

How do I set correct Z nozzle height for both nozzles?  
Prusa does a caibration print routine built into the Prusa Mini to help the user, but how do I do this on the Taz Pro?

Kind regards,  
Marout Sluijter-Borms

---

_[View the full topic](https://forum.lulzbot.com/t/solved-taz-6-auto-leveling-is-0-5mm-off-now-perfect-to-0-01mm/6250)._