First off, the obvious bit - you need access to a 3D printer, or to be happy to use one of the many websites that will print off a model for you.
I bought a SUMPOD (www.sumpod.com), because it was cheap, sturdy, and made in England, not very far from where I live. This is like most of the 3D printers you can buy now (MakerBot, UltiMaker, Printrbot) in that it prints upwards in layers using extruded ABS or PLA plastic.
On the software side, I'm using Linux as the Operating System. All the software below is available for Windows and Mac too, but it may be more of a hassle to install it.
Bash (comes with Linux and Mac, on Windows you might need MinGW : www.mingw.org
On Ubuntu Linux, all you need to do is type the following command to install everything:sudo apt-get install openscad imagemagick potrace pstoedit
On other operating systems you'll probably have to do a lot of googling!
You could always try using a Ubuntu Live CD (http://www.ubuntu.com/download/desktop
) to boot up Ubuntu Temporarily and try this out. It's probably a lot easier than the alternatives!