Detailed Z-Axis Calibration Issue  

Detailed Z-Axis Calibration Issue

Doubtless you've seen the error "Calibration failed! Check the axes and run again. Z-Axis failure"

I just finished a fantastic 34-hour print in PETG on my very-stock Prusa MK3s+ v3.13.2 directly from the SD Card and it turned out beautifully. I removed the plate and then the model and cleaned the plate with soapy water and EtOH.  After I've replaced the plate properly, it absolutely will NOT calibrate the Z axis. The XYZ Axis Calibration runs just fine, as do all other calibration tests, but the Z calibration returns the above failure every time. I've tried it both with the proper z-offset, measured both mechanically with feeler gauges, and carefully calibrated with squares and temp towers.  I've followed all of the advice from the masters - Joan among them. (she's awesome) 

Easy Fix: https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/calibration-failed-check-the-axes-and-run-again-7/

Mechanical Fix: https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/psa-how-to-fix-calibration-failed-check-axes-and-run-again-for-z-axis/

Joan's Start Calibration Hack: https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/z-calibration-issues-3/

I've loved learning this printer, but I'm about at the end of my rope, and these Bambu jokers are starting to look good. 

Can anyone help keep a Prusa user?