About this 3D model

I saw thing:423597, but it was just a .STL, As i wanted to modify it I made this OpenSCAD model. So just to show off, and to help new members in my local Hackerspace: http://swansea.hackspace.org.uk/Main/HomePage You can change diameters, wall thicknesses, gap,number of layers. so you can tweak it for your printer, Enjoy Ceri Oops forgot OpenSCAD file :(