Gantry Not Level or Sagging

Document the failure and confirm that it matches this guide: Nozzle height differs left to right or the gantry drops when motors are off.

Return extreme overrides to a known printer, nozzle, material, and slicer profile so the diagnosis starts from a stable baseline.

Check dual-z sides out of sync. Power off and compare both sides.

Check loose frame or gantry hardware. Square the gantry mechanically.

Inspect uneven wheel/eccentric adjustment. Check wheels and couplers.

Rule out coupler or lead screw issue. Re-run mesh only after alignment.

Change only the single setting or hardware condition supported by the evidence, then run a small test that reproduces the original failure.

Compare the test against the target condition, record the successful value, and save it in a printer/material profile before repeating the full print.