Hi!
I’m hoping someone else has run into the same issue and can give me some hints what I might try to fix this.
My problem is that over time, the z-axis positioning of my relatively new Elegoo Neptune 4 Max seems to become slightly unstable. That is, after I level the bed and adjust the z-offset, everything looks fine. However, if I move up and down by a couple of centimeters for a few times, the z-offset is wrong again.
Due to this, I had to restart quite a few prints now, because wrong z-offset leads to a bad first layer.
Now I wonder what I should attempt first in order to fix this?
start by checking the coupling between Z-stepper and threaded rod, it may be slipping if it has become loose.
Thanks, gonna do that first before I start my next print. This sounds like a really plausible cause!
Even if it feels tight, give the grub screws a tightening just for good measure, maybe some loctite if you have.