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I got tired of the paper method and adjusting the screws by the auto-leveling results as I could never get them to be consistent. Now I used mechanical level indicator and got these consistent values indicating that the bed is tilted to the right/left?
To my suprise it can actually print something like this but what would cause these values? My suspicion is that the Z axis is sagging but I would like to get some opinions before completely reassembling the printer.
Wouldn't the simplest explanation be that the left side of the bed should be lowered a little?
It is already at the lowest it can be but I'll try raising the right side again
I'd suggest loosening all the bed screws as much as is practical and then redoing the mesh. That way you've got lots of room to lower high spots.
If the tilt is too extreme, you might also be dealing with a sagging gantry. I'm not familiar with your printer model so I don't know how likely that is or how you'd go about fixing it though I'm afraid.
Is your z axis driven by a single leadscrew? Google x axis sag as I think this is what you are facing.
If you have dual leadscrews you just fix one and raise the other to tram the x axis to the bed.
If you have one leadscrew... Google x axis sag as I don't have much experience there
You mention that you used an indicator? Is it applying force? Does your bed or you X axis deflect?
So you've used one of those mechanic leveling tools to manually set the screws so that the bed is the same distance from the nozzle in all 4 corners, and the automated probe is telling you that it's 1.5mm off from left to right? That's pretty weird.
Someone else mentioned there being flex/deflection in things, and I think that's something I'd look at first. But I'd also look at the sensor and see if there's a reason it would do that. Is it still the stock black or blue sensor? I never had problems with mine, but I've heard a lot of complaints about them, mostly that they're not accurate, especially on certain surfaces. Since they sense metal, maybe your bed has extra metal on one side vs the other?
I'm just spitballing here because it's weird enough that I can't really imagine what's going on.
Upgraded to the black sensor because otherwise it wouldn't detect the glass plate
Ah, I didn't realize the black sensor could do that.
Have you tried calibrating it with something covering the plate? Maybe painter's tape? Can the plate spin 180 and calibrate there, to make sure it's not different somehow on the right and left?
Am I stupid? Tried leveling by hand and now I'm getting these weird results again as if the glass bed is higher in some spots..
https://i.imgur.com/ewmkeQJ.png
I've never gotten these values to be close to each other (less than 0.5 difference)
edit: I don't get it.. the glass bed is perfectly level by itself. How can the printer read high spots on it?!
