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Variable density infill or void creation?

Posted by Opus 
Variable density infill or void creation?
August 18, 2014 07:09PM
Has anyone done/seen any experiments with variable density infill, or detection of solid regions that could be turned into interior voids? I'm printing some fossil skull models, and they're really just nig solid lumps. It's a battle between getting an infill density that the top layers don't collapse into, and printing time/plastic costs. There's so much space inside that could be empty, or filled very sparsley, as long as the fill density got higher near the upper surfaces of the object.

I've got no great ideas yet on how to implement this, just wondering if anyone as done anything along these lines yet?
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