# Another bed leveling post

**URL:** <https://forum.snapmaker.com/t/another-bed-leveling-post/17536>\
**Category:** Snapmaker 2.0 (3-in-1)\
**Created:** [April 3, 2021, 4:43pm UTC](https://forum.snapmaker.com/t/another-bed-leveling-post/17536 "2021-04-03T16:43:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![flettz](https://avatars.discourse-cdn.com/v4/letter/f/e274bd/32.png) [@flettz](https://forum.snapmaker.com/u/flettz)\
**Post date:** [April 3, 2021, 4:43pm UTC](https://forum.snapmaker.com/t/another-bed-leveling-post/17536/1 "2021-04-03T16:43:33Z")

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I’m pretty new to 3D printing, and I’ve been having problems with leveling the A350’s print bed. I’ve read through a bunch of the posts here, and tried a few things, but I’m still getting pretty bad first layers.

When I run the auto-leveling tool on the A350 (5x5 matrix), I get the following results:

> M420V  
> M420V  
> others \< Bilinear Leveling Grid:  
> others \< 0 1 2 3 4  
> others \< 0 +1.900 +2.656 +2.489 +2.490 +1.772  
> others \< 1 +2.990 +3.741 +3.619 +3.522 +2.860  
> others \< 2 +3.847 +4.287 +4.060 +4.154 +3.647  
> others \< 3 +2.721 +3.400 +3.371 +3.311 +2.724  
> others \< 4 +1.434 +1.975 +1.806 +1.899 +1.532

The \>2mm difference between the center and corners seems large, so I tried doing manual leveling, instead, and got:  
others \< 1.85 2.60 2.40 2.40 1.65  
others \< 2.90 3.70 3.55 3.45 2.85  
others \< 3.85 4.30 4.00 4.20 3.65  
others \< 2.75 3.40 3.35 3.30 2.75  
others \< 1.35 2.05 1.85 1.95 1.55

It’s a little different, but gives the same overall profile, so it seems like the auto-leveling is working as intended. After both the auto leveling and manual leveling, I tried printing a couple of semi-spheres across a decent area of the print bed, and got very similar results:  
[https://drive.google.com/file/d/1\_cNvxNMgY2qRO\_chGyupUEJ\_1Nt9HViM/view?usp=sharing](https://drive.google.com/file/d/1_cNvxNMgY2qRO_chGyupUEJ_1Nt9HViM/view?usp=sharing)

You can see that as the print gets closer to the center of the bed, I lose the first layer, suggesting the nozzle is too low. Towards the corner, the filament gets a little stringy, suggesting the nozzle is too high.

I’m not quite sure where to go from here. One other thing I checked was whether the heated bed was screwed down properly, and I saw that the nuts at the corner seemed to be closer to than the ones towards the middle, but all the screws are tight when I try and turn them:  
[https://drive.google.com/file/d/1\_ZHoUvNzxLBo\_uUJ9QOd0rCJ01sghnjU/view?usp=sharing](https://drive.google.com/file/d/1_ZHoUvNzxLBo_uUJ9QOd0rCJ01sghnjU/view?usp=sharing)

can’t add more than 2 links since I’m a new user it seems, but the middle screws have maybe 2 threads showing, rather than the nut being tight against the bottom side of the bed.

That probably explains why the corners have a lower z-offset number, but doesn’t explain (at least to me) why the print head isn’t compensating for it.

If anyone has thoughts, I would very much appreciate help.

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**Author:** ![flettz](https://avatars.discourse-cdn.com/v4/letter/f/e274bd/32.png) [@flettz](https://forum.snapmaker.com/u/flettz)\
**Post date:** [April 3, 2021, 5:35pm UTC](https://forum.snapmaker.com/t/another-bed-leveling-post/17536/2 "2021-04-03T17:35:33Z")

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Ha. Think I figured out my problem - I have the aluminum platform on upside down. That doesn’t matter for the smaller prints I did just in the middle of the platform, but for bigger ones, it’ll matter quite a bit.

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**Author:** ![nivekmai](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/nivekmai/32/15480_2.png) [@nivekmai](https://forum.snapmaker.com/u/nivekmai)\
**Post date:** [April 3, 2021, 10:04pm UTC](https://forum.snapmaker.com/t/another-bed-leveling-post/17536/3 "2021-04-03T22:04:32Z")

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I was just about to say your bed is probably upside down… You definitely shouldn’t be exceeding ~.5mm, and if you are, it’s almost definitely upside down (esp w/ that huge bulge in the middle you saw).