Layer Thickness and Wall Width - Design Reference Ruler 0.4 to 5mm

You might also like: https://www.printables.com/model/280185-design-reference-radius-ruler-innerouter-1-to-12mm

In the computer everything looks huge, but in reality 1mm could be enough or may be too flimsy depending on what you’re trying to do. This provides a real life reference you can look and feel, so you can optimize your design, making the iteration and design process quicker and it will help you get your design right first try.

They are designed to fit inside Digital Calipers Case.
 

Wall model steps

Thickness model steps