Slice Modifier. Add a Cap Holes above it or you'll have "open" meshes. You may have to mess with materials, because the slice+cap creates polys where there weren't any before and they will probably have the wrong materials on them.
Max 2016 (SP1/EXT1)
Win7Pro x64 (SP1). i5-3570K @ 4.4GHz, 8Gb Ram, DX11.
nVidia GTX760 (2GB) (Driver 430.86).