@droftarts do you have an advice in regards to the topic main problem ?

@phaedrux rotating the buildplate 90° has a slight improvement.
Will test another buildplate tomorrow and also clean both.

Shouldn't the meshbed leveling be capable of compensating the slight tilt? As done by the original Prusa ?

Have ordered springs and knobs to adjust the bed will also try this (I am afraid I can't use it because of narrow space between Y carriage an frame)

PID is tuned, this one I ruled out already.

Will report the progress tomorrow with both buildplates cleaned. If both show the same artifacts I think at least we can rule out the buildplate.

Next guess would be move the print around on the buildplate, maybe de magnets in the bed interfer with the hotend and push it down while printing over magnets ? Does this sound reasonable to test?

@ccs86 ordered the device will come in latest in the weekend. Then we know more and have numbers. Thank you mate

@ccs86

"I totally agree that if your Z axis is binding, it will not be able to track with the tiny mesh compensations. You could physically test this by setting up an indicator between the carriage and bed, then requesting tiny Z moves up and down, to see if the actual motion is reliable."
You mean like measuring it with a feeler gauge, moving z axis up down left right and back to the spot and see if its still exactly like before (the same distance measured with a feeler gauge?

"Also, double check that your probe offset values are truly correct. It isn't hard to get them inverted."
I will also double check but I think I already did that as well.

@droftarts just ordered 8mm steel balls, to rule this out as well, seems like a good tipp anyhow.

Did manually level the X axis, this slightly improved the result, but still same artifacts with less magnitude. I noticed a Z motor was slightly tilted. Didnt had time to decouple the Z Stepper motors and to make them indepedent, will update soon. However do you have any tipp to test for binding? If I move the z motors by hand it seems to run smooth.

Will collect the results of today and will upload it tomorrow, for further details on improvement.

This is what the heighmap looks now:

@droftarts regarding the both z steppers, I also thought in this direction but could not find how others fix it. Seems that I got alot new hints how to tackle the issue. Irrespective the other Tipps I think a proper way to sync the motors is anyhow a good idea

@phaedrux rotating the buildplate 90° has a slight improvement.
Will test another buildplate tomorrow and also clean both.

Shouldn't the meshbed leveling be capable of compensating the slight tilt? As done by the original Prusa ?

Have ordered springs and knobs to adjust the bed will also try this (I am afraid I can't use it because of narrow space between Y carriage an frame)

PID is tuned, this one I ruled out already.

Will report the progress tomorrow with both buildplates cleaned. If both show the same artifacts I think at least we can rule out the buildplate.

Next guess would be move the print around on the buildplate, maybe de magnets in the bed interfer with the hotend and push it down while printing over magnets ? Does this sound reasonable to test?

@droftarts do you have an advice in regards to the topic main problem ?

@64bit https://duet3d.dozuki.com/Wiki/Setting_up_automatic_probing_of_the_print_bed

Obsolete information

The remainder of this page describes G32 bed probing for bed compensation, which is no longer recommended. For G29 bed probing, see Using mesh bed compensation.

@fcwilt unfortunatly the result didnt change, when using the center in the homeall.g

G1 X92.5 Y93 F3000; Z safe homing

The heighmap now looks different, but in general yields the same information (at another z-height). I retested it center + probe offset but I didn't behave differently. Still pretty much the same print result.

as I dont have a mesh.g I also cannot share it (according to documentation it instead just uses G29 S0).

@fcwilt Hi, thank you for taking the time to take a look at my problem.

You are right, its off center. Ill try to rectify it. Should the nozzle or the sensor be at the center of the bed?
It was subject to several tinkering changes, but its not center you are right, I thought it compensates for it as the heighmap is the heightcompensation based on the G30 in homeall.g. Therefore thought it doesnt really matter where the reference z=0 is measured because each point individually is again measured during mesh leveling (G29).

Nozzle centered would be X:92.5 Y:93, if senor should be centered, then i would just add the offset (X:-33,5, Y:-26).

In my start g-code I use:

G28 ;Home
G29;

To G28 home (I guess it calls homeall.g) and then use G29 (mesh.g).

Ill test it again with nozzle centered to the bed during G30 and will report results. I will also attach my mesh.g

@phaedrux thank you for your reply. As with the original Prusa bed, mine is fixed with aluminum spacers and cannot be adjusted currently.

Ive been following your suggestion and tried 10:10 Mesh leveling, but the result is pretty much the same. What confuses me the most is not the uneven result, but that it seems that the compensation fails at the orange / purple areas, as these are close to each other one is to low and one is way higher.

M557 X30:140 Y40:140 P10

Results: