Bed flat at origin,inclined during prob sequence before printing

[Sowlan]

@Veti said in Bed flat at origin,inclined during prob sequence before printing:

https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors

Tank you for your fast answer.
Yes based on wiki I had yet make some changes in config.g for M671 (leadscrews positions) and in bed.g G30 (probe near leadscrews) but maybe you ask to me to focusing on it because my drive mapping show M584 X0 Y1 Z2 E3 and not Z2:4 for independent Z move, I'm intrigue by the fact independent Z move is here yet this's show by this problem and I the case I want static position on Z steppers I think this configuration is good. But is you are any idea about that I take it.

change S80 to S10 and see how that looks.

I had make this change but no really change

resultats:

my start test look like this

Now after press on true leveling button

and probing sequence before printing

[Veti]

@Sowlan said in Bed flat at origin,inclined during prob sequence before printing:

I had make this change but no really change

Please run Mesh bed leveling not true bed leveling.

@Sowlan said in Bed flat at origin,inclined during prob sequence before printing:

M584 X0 Y1 Z2 E3 and not Z2:4 for independent Z move

without that the duet board can not address the z steppers indepenently so true bed leveling will have no effect.

the case I want static position on Z steppers

i dont quite understand, but as soon as power is off the position can be 2 full steps out of sync.

[Sowlan]

@Veti

Please run Mesh bed leveling not true bed leveling.

Ok now I understand more clearly the difference between both fonctions. Mesh bed leveling shown me an 29G error due to S10 is too low it tell me to try it S11.5, that's result more what you went, some think look like small ski area for fourmis.

I have one G32 in my start script Simplify3D, I will delete it, leave G29 S0 and use S50 for grid mesh. and testing to print.

[Sowlan]

The problem hasn't changed

When I click on Mesh bed compensation button I have this:

and when I run printing mesh bed compensation change for that and printing result is very bad

[Sowlan]

Same test with S11.5 in M557, it's frustrating

mesh compensation without printing run

and now mesh compensation before printing

[Sowlan]

Ok now I know what is the cause of problem but don't know how repair it.
It's bed heating !!!

test with bed heating off

and now with with bed heating on at 60°C....

Now what about my materials, I using d42 IR sensor with metal plate and modified CR-10 with magnet under it. Somebody know if by reputation something provoke it magnet, hearting, electromagnetism,etc... ?

[Sowlan]

I don't Know if this problem interest any peoples but I continue to investigate...

Now I tried same test without metal plat, probing on nude surface

without metal plat and cold bed

without metal plat and hot bed at 60°C

If any body know where come from this effect I'm interesting, Maybe @dc42 how have same name than my sensor have an idea?

[dc42]

I suspect that the bed heat is causing the bed to warp. However, the large amount of variation in your height map indicates that the IR sensor does not work well with your bed surface. What is the bed made of?

[Sowlan]

@dc42

Hi thank you for you answer, I'd bought BLV kite from Bluerolls at aliexpress the bed I have is here

it's 310x310mm bed with metal plat and on the plate I have PEI protection.

Now I suspect something other, the side who falling is connector side, maybe electromagnetism from bed is the problem, I had do speed test with aluminum paper between bed and metal plate, with bed heating I view where the paper exceed out of bed mash map is relatively plate. Now I doing new test with exceed aluminum paper out of bed to view if it's that. I will be busy the next hour but I come soon with result of my test.

[Sowlan]

@dc42
Finally I have small difference but not significant difference...

With metal plate, cold bed and paper aluminum border exceed

With metal plate, hot bed at 60°C and paper aluminum border exceed