Print surface flatness / level checkinatornatron5000

Designed to help check whether your bed is level and as is so common with PCB heated beds, whether or not it dips or has a high spot in the middle.

Customise to your desired print bed size. Note: Actual print volume may be smaller than your actual bed size due to clips etc. Ensure print will fit your bed before commencing.

One is for diagonal and one is for horizontal / vertical. Pick whichever one suits you, if there's a particular spot on your bed you suspect of being uneven, etc.

Added a combined version that does both horizontal and vertical.