Z-Offset Test - < 2 min print time, < 1 g Filament

Basic Z-Offset test that can VERY QUICKLY show problems with z-offset, z-retraction, xy tolerances, and flow rates. Takes about 1 min to print on a 0.6mm nozzle and uses 0.61g of filament. This is great for fine tuning and walking in settings without having to waste lots of time and filament.  The ideal outcome is a perfectly smooth surface with no lines and the center circle is detached when this is taken off the plate.  Look out for wavy, ruffles texture or the opposite, unconnected strands only anchored at the walls. You can also check for improper fill to wall adhesion as well. If bed level is a concern (you should have done all the built in tuning for pid/leveling etc before this stage), you can clone this model and place square in the center and each corner. If the whole bed is tilted, you will have signs that look like Z-offset issues but only one a few of the squares. If your bed is really bad you may see only parts of the squares showing those signs.