The script creates a panel within Blender's 3D tools menu where the thickness and dimensions of the cutting material can be specified. The slices will be roughly arranged to conform to the dimensions of the cutting material, although it does not do a perfect job of this, and exports a SVG file with the name 'blender file name'-laser.svg to the directory where the Blender file sits. The slices are all grouped together in the SVG file, but if you ungroup this top-level grouping then each slice can be rearrange on the page. Slices are taken in the z-direction so make sure the mesh is orientated properly. By default 1 Blender unit is 1 metre. AS SVG files do not understand dimensions the scaling of the SVG file might change when loading it into your laser cutting software, so check for this. Below are the slices through the head of our holy mother, Suzanne.
Alas poor Suzanne, I knew her well.