3.5s+ upgrade, can't get x axis calibration to complete successfully
I know this problem is posted somewhere else in these forums, but I'm having the dreaded x axis calibration failure (with no diagnostic message to help) after upgrading my 3s+ to a mk3.5s+, and changing out the pinda for the superpinda. I've literally spent hours on this at this point. here's what I've checked and tried:
* verified that zip ties are not interfering
* checked for smooth operation across the axis. rods are clean and bearings seem OK
* tried with belt "a little tight", "a little loose", "too tight", "too loose" and perfect, all have made no difference - any value between 58 and140hz onthe belt tuner
* removed screws in back end of hot end fan, they may have been contacting z axis screws (no change)
* held heat bed cable bundle aside during calibration to make sure it's not interfering
Sometimes the calibration will bounce off the left side many (>20) times, other times only a few, but I always get a fail .