Z-tilt not correcting tilt along Y axis

[thin lodge]

You can see a clear slope trend along Y axis. The front two corners are nearly the same, and the back two corners are nearly the same, but Z-tilt should be making them level, but it is not. There is also gantry bowing but I can't really do much about that

[hardy bison]

Z-tilt levels based on three points. Frontal corner and middle point in the back. Watch https://www.google.nl/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjVuZKjlaz9AhWhif0HHXWVA4MQwqsBegQILhAF&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3Dh7ZTq2dDTkM&usg=AOvVaw1MmNpdqBahWBRMtNh5PHka on tips to adjust the frame to get the back corners more inline. If you don’t want to click the link google “RatRig V-Core 3: How to Get a Square Frame”

[rapid zephyr]

front Y rail corners need to come down to get the backs up!
Unless you have rally HIGH Z acceleration, compared to your XY accels,
Z is not going to move fast enough to compensate
The X axis bow CAN be dealt with. It's a matter of getting rid of the bi-metal strip effect of gantry and steel rail. a CF tube will help but the dual reallyl seems to be the way to go

[upper forge]

Did you ever solve this issue?

[thin lodge]

It seems to be better after changing my X rail

[upper forge]

How much better, and what led you to change your rail?

[thin lodge]

With MGN9, the gantry was bowing and the toolhead has play. After changing to MGN12, gantry is almost flat and toolhead is stiff, variance is down to less than 0.2mm

[upper forge]

Wow. What a change. Do you recommend the conversion?

Edit: Wait, isn't MGN12 stock? I take it you had a custom lightweight gantry, then?

[thin lodge]

I changed to MGN9 for speed but now with AWD, I can still print fast with MGN12, but without the bowing gantry

[upper forge]

How much better did your bed mesh get after the change back?