So I've had my Ender 3 for a few years now, but haven't really used it all too much. I have printed a few things successfully, but ALL of them have had the same issue, which has me wanting to throw my Ender 3 out of the window.
Let me start with what I've done. I've calibrated, adjusted, measured, readjusted, recalibrated and followed every single video guide, written guide and suggestion I could dig up regarding anything remotely close to the issue I have. But i'm thinking that mine is just unique(ly screwed up). I have a glass bed, and as far as I can tell, using a metal ruler, it is completely flat across the plane. I have the solid bed mounts and the EZABL from TH3D as well. I've checked that my eccentric nuts aren't free rotating but snug enough that all axis roll smoothly too. The EZABL does a 3x3 probe and all seems to function as it should...until it doesn't.
Now...the problem. Not a single section of the bed is printing at the same height. For instance, and these are arbitrary numbers to get the point across, while facing the printer, the bottom left prints at Z-offset of -3, while the bottom middle prints at -2, while the bottom right prints at -1. Then the middle right prints at -1.2, back/top left at -1, then the back middle at -2, then the back right at -3.5 and on and on. So I have sections that scrape against the glass bed, others print perfectly while the rest are basically having filament fall onto it. Again these aren't actual numbers, as they're never the same, but the deviations are always present and always wildly different from each point on the bed. I could sit at the printer for hours while the first layer prints and adjust on the fly over and over, and once the initial layer is done printing, I can generally leave it be and it'll print well enough for my needs. But I'm tired of doing that, and honestly should not ever have to.
I have no idea if the EZABL is just not doing anything regarding these deviations, I missed a step while installing and configuring or something else entirely is going on. I'm seconds away from tearing my hair out, unplugging my printer and never using it again. I'm incredibly frustrated. I thought I could figure this out on my own, but clearly I cannot. So before I make $300 worth of 3D printer a dust magnet or dumpster fodder, I need help...badly. As the subject indicated. I'm at my wits end.