Paramertic storage box with round or rectangle holes
thingiverse
It's parametric storage boxes with round or rectangle holes designed in FreeCAD. You can change parameters in Params spreadsheet as is shown in screenshot (don't forget to add units - mm or something else after values).  then select Body in sidebar and File->Export to STL or other format.  As example there are attached 6x4 boxes for AA and AAA batteries. Have fun and print it!
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