Just a simple 255mm*255mm Square Layer, to assert Dominance on the Other Printers with the no Build area. Test your First Layer Bed Levelling and Adhesion.
 

Remove the Purge Lines if possible, as it is in the build area and will get combined with the print, as I made the same mistake.

-If you get adhesion Problems, Wash/Clean the Build Plate, and try again.

-If you get uneven Z Height levelling, Make sure bed is Properly Placed and Do the Calibration.