A simple but very effective parameterized box divider (now with optional sidewalls!), intended for lasercutting but probably printable as well (I haven't tried). Simply measure the interior diameter of your (rectangular) box, choose the number of divisions and the material thickness, and go. Very useful for making small compartments inside old cigar boxes and such.

By default, the "flat" version should let you produce a DXF file in OpenScad, which is what you want for the lasercutter, but the "assembled" version might be useful for some folks who want to print them (and just for seeing how it should come out). You may have to download to get the DXF (set flat_to_assembled to "flat", and in OpenScad, "Design->Compile and Render (CGAL)", then "Design->Export to DXF").

I have added sidewalls since my first production test, but the new version has NOT been tested.

The dividers shown were laser-cut in 3mm MDF and placed in a 1970s-era cigar box.