I think I fixed it!!!!
Little back story, got my shine new S1 pro on primedays. My first 3d printer super excited put it together as is in a rush. Everything ran awesome. ABL was fantastic. For 2 kg spools of petg. Looking to do some improvements I got e3D x-nozzle. When I was putting it in I found the z and y was sloppy. (Remember that). So I thighented everthing down. Cleared the settings did a manual level. Followed by a ABL. This is when I wanted to throw it out the window and move on with my life. If I could get the first layer to laydown it would fail by the 3rd. For 2 weeks now nothing but failed leveling. Way high in the front, low in the back after ABL almost always. Nothing was working. Again worked awesome out of the box. Took the new nozzle back out update to the new laser/fdm firmware. Still broken. Was doing some thinking this morning. Thought what else did I change? Well tightening the cam wheels on all x, y and z. So I loosened all of them to where there was the slightest amount of slop and the wheels spin freely. Now I cleared the setting. Leveled by hand. Followed by the ABL. Checked it with a level print. Working prefect again. Boys make it loose and it might fix your too. Try and get back to me. I hope this is it. 2 prints in looking great!!
1. Loosen all Axis just to the point of a tiny bit sloppy.
2. Clear settings(factory reset)
3. Manual level with paper all four coners and 80c
4. Run ABL
5. Be happy with your printer again.
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