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Update: Check out my new FreeCAD Gridfinity Workbench for many more options and features: https://github.com/Stu142/FreeCAD-Gridfinity-Workbench
The file allows the ability to edit the size of the bin and features very easily even making changes outside of the Gridfinity standard, such as:
To export an STL, select the body in the feature tree, then file>export, or ctrl + e
You can find a guide to editing the FreeCAD file here: https://github.com/Stu142/Freecad-Gridfinity-dimension-variable-editing
Gridfinity Documentation to understand the dimensions of the model can be found here: https://github.com/Stu142/Gridfinity-Documentation
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M3 Screw Set : https://geni.us/gfP7w (Amazon)
M3 Heat Set Insert: https://geni.us/Svm0Sl (Amazon)
The author marked this model as their own original creation.