Processing scheme
thingiverse
You didn't discover a method for attaching files to a Makerbot group entry; however, you found an impressive Processing scheme at http://pycam.sourceforge.net/. You added more 3D printing apps with hyperlinks to the project pages, which may be helpful when asked about software options. If your preferred app isn't listed, feel free to add it. [31.12.2011: Slic3r added]
Download Model from thingiverse
With this file you will be able to print Processing scheme with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Processing scheme.