Parametric Flexbox

This is a parametric version of FdS' flex-box.

You can edit the file using your favorite text editor (notepad, vi, emacs, pico) to change the height, width, and length of the box. Then send the file to your laser cutter and you will have yourself an awesome little box.

edit: v 1.1 some clean-up and bug fixes

v 1.2 hopefully squashed that bug

v 1.3 fixed an issue with long decimal numbers