I'm using the Cut and Fill tool in the 3D analyst toolbox to find the difference in volume between two sets of raster files.

I'm wondering if there is some sort of error margin that is possible each time I run the tool? For instance, does it round values so there might be an error of 0.5 meters in each pixel?

Very familiar with the tool and the 3D toolbox, but I have yet to find anything beyond the basic description of how the tool works

Not sure I follow, but since you are working with rasters and raster representation of geometry, then there is an inherent approximation. What sort of cell size are you working with?