My borosilicate glass cracked. While waiting for the heat bed assembly to be available in the UK warehouse I got some 30x30 IKEA mirrors to try to print without a heated bed.
The problem comes when trying to level the bed. It seems impossible. I first thought I might need to re-level the X axis. However, it seems some sort of cross-axis problem. I have unscrewed the front-right levelling screw as far as it will go without becoming completely unscrewed from the aluminum bed, and the printhead is still too high. However, the rear-right screw is completely tightened and it’s at the proper level. The rear-left screw is not as high as the front-right, but is also quite high, while the front-left is not as tight as the rear-right, but almost. I’ve attached a few pictures which will hopefully show the problem.
In summary, front-left and rear-right seem to be too low, while front-right and rear-left are too high.