I have issue to print , tried to calibrate, level up, also changed Extruder Gear which pulls filament from plastic to metal, changed nozzle to 0.6 ,but it looks like some times does not print / extrude or there is some defect. when calibrating , small objects seems to be fine but this big one cant figure it out how to fix.
i could not understand if the photo has some color issues or if your printer burned down your house. If i evaluate just the problem on the printed first layer, it seems like a filament issue. I would try; 1- make sure that using a good, new, DRY filament, 2- increasing print temperature(not print bed temperataure) by 5 degree celsius, if both did not work, i would try to print the model in a different orientation since this one have an extremely large rectangular surface for the first layer which increases odds in favor of failure. if all these fails, i would try to use a different slicer. if this one fails too, i would consider cold spots on build plate which is likely to be the last cause.