What should I save my Sketchup model to import Vectors to Aspire or VCarve?

Aspire V4.514 and higher and VCarve V7.514 and higher can read Native Sketchup format (.SKP).

Load them from File Menu -> Import... -> Import Vectors...

 
Also you can now drag and drop .SKP files directly from a Windows folder into the 2D Drawing window to begin the Vector import process.