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Having issues with boolean difference in blender

I'm trying to make a mould to inject resin into. But when I use the boolean difference function to cut the part into the blank it doesn't work. Some of the part appears to be there and there are some of flickering areas indicating some faces that are intersecting, but it isn't making a cut into the blank. 

 

The part is an imported STL but the sprue was made entirely within blender.  I'm not sure what the issue is. Is there a way to make blender treat an object as solid? 

 

Thanks in advance.

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