I needed a variety of Z height adjustment tests. So I created a variety of heights (.15, .20, and .25 mm) and a few different types including 140mm square and circular prints.
This should let you visually asses your Z axis height. In my opinion, it's a bit easier to have a nice large print area kicking out than the prusa built in line after line then squiggle at the end. It never has enough area for me to dial in the height properly beofore it finishes.
You'll want the file with the correct height for a single layer print. Make sure the file's height matches up with your current settings in your slicer.