First Layer Calibration Shapes - Customizable

Update 31.07.2022: attached mini handle, to make removing the print much easier.

Gosh, first level seams to be wrong :-(
Well, what can I do... ;-)

For first level printing height calibration and optimization I "designed" two simple shapes.

+ Simple one is just printing complete area defined
+ Other model just place a selected number of connected measurement points to the sheet. That's much faster and should give you a good setting for z-level calibration already.

In provided OpenSCAD file (.scad), you can adjust settings to match your printer, like:

+ print dimension in X/Y
+ first layer height
+ number of measurement points to print
+ full first layer, or measurement points only
+ ...

How I used it:

+ get a rough first z level value you think usable (live adjust z)
+ make a print & check surface.
Are there holes because you print to high?
Is the surface quite rough/thin because you print to low?
+ adjust z level via "live adjust z...".
Therefore you m