visual bed level & nozzle height printer test

I designed a high temperature bed for printing exotic filaments on my cetus and I wanted to know what to expect from the new bed.
Use this test only after you have a level bed. All beds have bumps and ditches and this test lets you see the problem locations. Knowing the locations allows you to re position your print on the bed and possibly get a successful print.
The spiral has a 0.6mm square cross section with 5mm pitch. Slice it but stop the print after the first layer. The transparency of a single layer print and the changing paving width shows where the bumps and ditches are. In a deep ditch of course the PLA does not even stick to the bed.
All spirals are printed counter clockwise center out and should have a constant width.
If the PLA is blocked by a extremely close bed, the nozzle pressure builds up and squirts out PLA when the bed to nozzle clearance increases (2nd pic outer spirals 7 o'clock).

My 4mm thick glass bed is level to +-0.002mm at the three mounting support