Manual Mesh: Z microsteps not reliable, not saving after Manual Tuning?

[Miq1]

(I did not want to further clutter the "Beware..." thread :wink)

I just flashed the 2.02i version on my 4.2.2 board with the GD32 MCU. Most of the things I tried seem to be working, but I got some irritations with the Manual Mesh part.

• When using "Manual Tuning", I noticed the Z microsteps sometimes seem to be ineffective. Regardless what values I set, the print head would not noticeably move. Leaving by "Back" and entering "Manual Tuning" again seems to solve that once.
• Second, after having adjusted all 5x5 mesh points (X=4, Y=4 then), there still is "Next point" to be seen, but no "Save Mesh" instead. Next point of course does nothing, but is the corrected mesh stored to EEPROM?

[Miq1]

There is something odd and I can not get hold of it. I did the whole tour from loading the defaults to the completed mesh and a print for the umpteenth time and still my issues are remaining. If you have a look at the created mesh, there is a "hill" right from the middle, but also two "rims" on top and bottom:

This may be, although I would not know why a steel PEI plate should be bent that way. But worse, the prints are disgusting - this is the first layer of an attempt to print a larger part:

It looks like the mesh is overcompensating the "hill". I did the leveling and mesh with a 0.1mm sheet of paper, that is why the Z offset is set to -0.08.

Any ideas what I may do wrong?

[Miq1]

One more observation. I am currently doing it all again, so I did a manual leveling with paper again. The paper was moving with a slight resistance at the Bottom Left leveling point. When creating a mesh again, I had to lower the nozzle at the first mesh point 0/0 to -0.07 to get the same resistance - why?
That is a distance of less than 20mm between both points and that should differ be the larger part of a tenth already? I cannot believe thaat...

[Miq1]

Thank you very much indeed! I completely understand that you have no time to care about single user problems and did not intend to force you into that at all. I was shooting at the dark here in the hope it might be a common effect that I simply had not run yet into.

I will start a systematic sequence of tests, varying different parameters like temperature, flow and Z offset, to see if I can get any improvement before taking apart my printer again. It was working before, so it may be that you are right and I cannot get around that finally...

Thanks anyway, keep up your marvelous work! 👍🏻