# Is a consistent first layer across whole of A350 build plate actually possible?

**URL:** <https://forum.snapmaker.com/t/is-a-consistent-first-layer-across-whole-of-a350-build-plate-actually-possible/20740>\
**Category:** Snapmaker 2.0 (3-in-1)\
**Created:** [September 3, 2021, 11:19pm UTC](https://forum.snapmaker.com/t/is-a-consistent-first-layer-across-whole-of-a350-build-plate-actually-possible/20740 "2021-09-03T23:19:29Z")\
**Posts on this page:** 1\
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**Author:** ![scyto](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/scyto/32/13938_2.png) [@scyto](https://forum.snapmaker.com/u/scyto)\
**Post date:** [September 3, 2021, 11:19pm UTC](https://forum.snapmaker.com/t/is-a-consistent-first-layer-across-whole-of-a350-build-plate-actually-possible/20740/1 "2021-09-03T23:19:29Z")

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Now i have solved my sloping bed issues, I continue to try and get the first layer to be the same across the entire build plate. the image below shows where I perceive I am failing. this is the print held up to a screen to act as a light box.

The source STL is [Bed Level Calibration Square Grid by wsreith - Thingiverse](https://www.thingiverse.com/thing:4894942)

 ![calibration test](https://us1.discourse-cdn.com/flex022/uploads/snapmaker/original/2X/3/3fb83808a02f0ae6b6eabf9d3ab99ce8209e471d.jpeg)

It is printed on a metallic PEI coated plate i purchased ages ago but have not used until today. This gives much better results than the black stock surface, maybe due to surface coating difference, maybe because it shows less deformation in the 11x11 calibration data?

1. are my expectations too high? (i hope not as have friends who have printed this on other printers and don’t have this issue)
2. Is anyone else able to print this 1 layer model consistently across 95% of their build volume?
3. what else can i do to try and get consistency? (it may prevent me from doing some large format prints i plan so this not academic)
4. why doesn’t bed levelling work well enough to counter this?
5. is it really a bed leveling issue or a variance in extrusion over the bed?

Help?

this is the catmull mesh that was applied during the print - it was created by

1. warming bed to 50
2. redoing all heatedbed screws to just light finger tight (seems to give better results than tightening them all to 1.2nm as per snapmaker guidance).
3. doing manual 11x11 calibration

i know some of you have suggested to manually adjust some of the underlying measured data points, happy to do that if someone can point me to a good guide / hand old me a bit?

 ![image](https://us1.discourse-cdn.com/flex022/uploads/snapmaker/original/2X/b/b6548d608c055d084ce22b5fabf98de84c051e89.jpeg)

note the matrix maps to the physical object so top of excel sheet is top of object pictures etc

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