I was trying my first passthrough print today and it failed because the measurement phase failed.
So, I tried “set focus” on various materials and they all “fail to measure”.
I’ve cleaned everything thoroughly. All windows on the bottom of the print head look clear.
When I try “set focus” on a spot in the middle of a piece of draft board, I do see the red focusing spot.
And this is what the lid camera sees after a calibration run: