Well, I do have the upgrade kit here - but made no use of it yet, since I do not use the scanner either … as mentioned above:
I pinned down the scanner pop-up poles early with a toothpick. these poles reside deep below the downside of the build plate since then.
But lately, all of a sudden, I get a lot of UH-OH #123. I guess the sensor came loose or went bad.
Through “calibration”, the print head now touches down on the plate just once, then retracts, while sotware is still displaying “please wait”. Not even trying to calibrate any more.