I like the #FreeGrid system more than other printable organizers because it uses nice reasonable metric dimensions and the module size is big enough for my large hands. :-)
The short modules with “cardboard” in the name are meant to be printed and then made as high as you want using shipping box cardboard. There is a groove around the periphery into which the cardboard slots.
The original FreeCAD design file is included so that you can customize the modules.
The author marked this model as their own original creation.