You might want to try out the script called Pixeled http://www.scriptspot.com/3ds-max/scripts/pixeled I doubt it will help much because I think its strictly 2D and not 3D voxel based, but there might be something that converts 3D to voxels which could give you some better results too?
Can't share what I am working on right now but another nice example I found is: http://forums.tigsource.com/index.php?topic=74.msg736603#msg736603 What I figured out in 3dsMax: Scanline * no anti alias * texture filtering * in 3dsMax global settings > render > disable dithering (causes noise otherwise on your render). Also…