I don't have a good grasp of the size of objects in millimeters. When designing things, I found myself always having measure out distances using my calipers to get an idea of if the size of the object is what I wanted, which I found annoying. This is meant to be quick reference rather than super exact.
This was printed on my Prusa MINI+ with a 0.8mm nozzle (0.4mm layer height, mostly 0.9mm extrusion width), so I made the text bigger to print better. With a smaller nozzle size you could probably reduce the text size and fit more things in the card.
The author hasn't provided the model origin yet.