Neptune 3 Pro, Prusa slicer won't stick on plate

[Bikeracer2020]

Suggestion........

Print perhaps 6-9 random 50mm x 50mm squares just 0.2mm thick on your bed.

This should show you how level your bed is and also if you need to adjust the 'Z' offset.

I think your nozzle is too close to the bed or is partially clogged.

[klopar]

I did it like you wrote but I got the same result.

[Bikeracer2020]

Did you print a few squares to check the bed level?

Can you go into your slicer settings and increase the 'Z' offset by either plus or minus 0.02 mm and redo the print and see what changes?

I'm assuming the photo is of the bed leveling which sets the 'Z' height?

The 'Z' offset is a fine tuning of the distance of the nozzle from the bed and only affects the first layer