You mentioned that the air soap cutter mold is grooved on the bottom so that the cutter wires can pass all the way through the block. What happens with the Manual Soap Cutter™, where there is no groove? Are you left with a little uncut bit at the bottom of the stroke?
The Manual Soap Cutter™ loaf table is grooved, the molds are not. The Air Soap Cutter™ mold bottoms is the cutting surface and it is a pretty automatic operation whereas you move the soap block on to the Manual Soap Cutter™ cutting table.