Filament Sample Card - Customizable SCAD

This is a Filament Sample card. There are many like it, this one is mine. I was inspired by many of them, but I wanted something I could easily tweak locally in OpenSCAD to generate a labeled sample of filament.

Code borrowed from https://www.thingiverse.com/thing:2972895 (I was not sure if I should call this a remix, as it is unrelated to the luggage tag, but I did borrow and modify the SCAD code that handles the text and text settings)
Inspiration for the layout comes from https://www.thingiverse.com/thing:2953888 - I really like that one but I did not want to use tinkercad.. I wanted an excuse to play in OpenSCAD more.
I included some sample STLs from the SCAD file just to give an idea what this makes.

It has a setting for either 4, 5, 6, 7 or 8 layer thickness samples.. I started with the 5 layout but I decided I wanted to move the keyring hole to the bottom to make room for longer text up top.. which led to the layout with 4 thicknesses.. a request inspired the modificati