Using the Craft Robo from Ubuntu 10.10.
Instructions on how to install GraphtecPrint for the Craft Robo are given here:
Having installed Graphtecprint as per these instructions, you need to install Inkscape.
If you are on KDE, you can use the “Adept” installer program to do this.
If you have not got Adept on your System, you can use Synaptic to get it. Does only work for Kubuntu.
I have so far managed to make the craft robo cut out a square.
The procedure is
Start Inkscape, draw a square, go to Print, select Postscript for output, and click on print.
This creates a file called output.ps in your documents folder.
Start a Konsole (BASH) and CD to the documents folder.
$ cd Documents
$ graphtecprint < output.ps
This will start the Graphtecprint program, and cut the square.