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libarea might be useful for additive machining (reprap) in-filling but would 
require a couple changes.  The changes however might also be useful in 
traditional CNC pocket operations.  

First, the fill pattern would need to zig zag across the pocket instead of 
forming concentric circles or spiraling in.

If that can be done, the tool-path on alternating layers needs to be 
perpendicular to each other  This is so that filaments don't end up stacked and 
provide a weak point for splitting.

Original issue reported on code.google.com by [email protected] on 9 Sep 2010 at 4:25