I wrote a macro for FreeCAD to generate BaseContainers for the Gridfinity System.

FreeCAD Macro can be downloaded from:

https://github.com/rurlaender/freecad/blob/main/macros/Gridfinity/Gridfinity.FCMacro

The container are only simple ones without holes for magnets and they are not stackable. I use them for my workshop drawers.

I added a few examples as STL what can be done after creating a base container.

The wall thicknes is set to 1,2mm fix if you want to change that you have to modify the macro in line 129 from

thickness.Value = 1.2

to what ever value you like.