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From the skeinforge output of my last build:

M8 Extruder Block 3 - 30.4 cc

M8 Extruder Idler Block 2 - 3.7 cc

39 tooth gear - 10.1 cc

11 tooth gear - 1.3 cc

Those are calculated extruded volumes with my particular skeinforge settings, but I build them fairly dense. Solid densities will be at least twice as much or so, but you should be able to figure that out from the STL's.