I’ve been fighting Z axis wobble for several months. Last week I noticed this post on Thingiverse. All it does is to replace the 5/16″ Z axis drive rods with #10-24 rods. I recreated the parts in OpenSCAD so that I could make SAE versions and installed it on my printer.
My Z axis wobble is essentially gone now.
I do have other issues – I fried my display panel plugging it back in incorrectly, and since I had to reprogram the firmware and I accidentally lost the previous copy I had to start from scratch on my firmware, but in the end I printed this with basically no wobble: