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This is a project for being abe to print arrays of boxes for storing
components.

Including a lid is not part of the current goals. The idea is for the 
array to only be moved short distances (meters) and so a lid isn't needed.

The array is defined by the interior dimensions of the boxes, the number 
of rows and columns, and the thickness of the base. There are a few
sets of definitions built in for my use, but you can also override
them on the command line without touching the code.

Currently there are built in defines for 4x4 and 3x3 arrays, with 4x4
the default. The intended about is for a 300mmx300mm bed with room
for a skirt.

For example:
`openscad -Dba=44 -o box-array-4x4.stl box-array.scad`
`openscad -Dba=33 -o box-array-3x3.stl box-array.scad`
