About this 3D model

This is a redesign inspired by http://www.thingiverse.com/thing:448 then I came upon fdavies' Hexagonal lattice pattern... http://www.thingiverse.com/thing:10566I like the effect.To newcomers to OpenScad: The scad files illustrate three of the simplest and most useful staples of openscad, dxf import and extrusion, stl import, object substraction.