Customizable Polygon Box

A Parametric Box based on a polygon, with or without roundings made with Openscad

Software: openscad.org

This openscad code is very simple and uses a 2D polygon with linear_extrude and the offset function with interior or exterior outline for radius.

Note for square: e.g. if you want a quare with 40x40 you have to use box_outer_radius=28