About this 3D model

This is derived from http://www.thingiverse.com/thing:19936 by Andrew Barton. I made one of these and thought it was a brilliant idea but I wasn't happy with the design so I made some improvements to suit my needs. 1. The lens is a push fit and needs no glue. 2. The adapter has been resized to fit over my iPhone4S case so I don't have to remove it to use the macro. 3. The top edge was thin and fragile over the flash hole. Since the flash overpowers close-up shots I never use it, so I removed the extra hole. 4. Now that the lens doesn't need glue, the hole in the upper layer is redundant. I have closed it off and added a small bump to grip the the front glass. This can be manoeuvred over the top edge of the case. 5. I made the rounded corners much smaller to overcome the nasty overhangs that distorted the first few layers. I am a complete OpenSCAD noob so please excuse my poor code but I decided to be brave and share it since it did use it and it did actually work!