# 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:** 19

<div class="post-metadata">

**Author:** ![openyk](https://avatars.discourse-cdn.com/v4/letter/o/439d5e/32.png) [@openyk](https://forum.lulzbot.com/u/openyk)\
**Post date:** [September 9, 2019, 3:07am UTC](https://forum.lulzbot.com/t/solved-taz-6-auto-leveling-is-0-5mm-off-now-perfect-to-0-01mm/6250/19 "2019-09-09T03:07:22Z")

</div>

This thread’s solution worked for me.

Taz Pro Solution Procedure:

STEP 1: Diagnose the specific unevenness of your 3D printer’s bed. Make sure to clean your nozzle first for accurate Z-probing.

- Taz Pro -\> USB Cable -\> Computer with Cura Lulzbot Edition
- Cura LE -\> Monitor -\> Disconnect, Connect, Console

Commands:

- M420 S0 (disable auto leveling)
- G28 (auto home)
- G29 V4 (auto Z probing, full diagnostics)

STEP 2: Add shims under the bed corner standards. Measure Z values and add/remove/adjust shims accordingly.

Shim STL file (0.2mm thick, single layer printing recommended) attached. Print about 10 of these as someone wisely suggested.

Use a 2mm hex key to manipulate the 1 washer-screw and 2 standard-screws per corner.

I did not like how the washers bent at an angle after applying some shims, so I redesigned the shims to have a smaller center-hole (3.5mm) to lift the metal spacer as well- but this was a problem as the washer needs a conductive path to the bed for the Z-probing electrical-sensing. So I reverted the changes and instead replaced the 8 standard-screws with A2 stainless steel M3, 16mm length, philips button head screws. The new screws (bigger heads) helped the washer sit at a more even angle, improving the accuracy of the Z-probing process.

STEP 3: Adjust your printer’s Z-offset then test your bed’s practical evenness by printing a calibration part.

When you add shims to the bed corners, your bed surface height may change. Therefore your printer’s extruder Z-offset may need to be adjusted (usually, raised; for the Taz Pro, raising the extruder = adding the the Z-offset; my z-offset went from -1.4 to over -1.3).

Testing STL file (270mm x 270mm x 1mm, 2mm line width) attached.

EDIT: Realized that the conductive path is maintained by the washer-\>screw-\>bed contact. Bed corner shim STL file version 2 reduces the washer mounting angle, hence improving z-probe accuracy. Dimensions of bed corner standard also attached for your reference. Also, for ease of shim adjusting, I replaced the aforementioned 16mm screws with 12mm screws installed in reverse (screwheads are under bed).  
[bed\_corner\_shim.pdf](https://forum.lulzbot.com/uploads/short-url/jTnSwNIbeAZ8qM2soIPruAHGrSl.pdf) (64.6 KB)  
[bed\_corner\_shim\_v2.stl](https://forum.lulzbot.com/uploads/short-url/bn9kIkfo1eWZuSX7UHGDZEeeszm.stl) (43.1 KB)  
[perimeter\_270.stl](https://forum.lulzbot.com/uploads/short-url/tE1Ut7LKcbuOeNfd7KNi5zOwP2t.stl) (15.7 KB)  
[bed\_corner\_shim.stl](https://forum.lulzbot.com/uploads/short-url/7lNGpLecYwMt06ebmakNZj08fbC.stl) (54.8 KB)

---

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