This is my first OpenSCAD part. I decided to start with something fairly easy, in this case a box and lid. If you have any suggestions, feel free to leave a comment.

To create a round box use the same value for width and length, then set the corner radius to half of that.

The script will always generate both box and lid. I might change this in the future. For now, you can just split the 2 parts up in Cura, then delete one of the two and print them separately.

Updates: 21 February 2016 - Added option to customize section height.