Basically, the metal structure stretches over the entire cake. Between each of the sides is a sharp thin blade or metal wire. Then, using cutting motions, run the legs across a level surface to slice the cake.
Place the cake on a turntable and use a ruler to map out where you need to slice. Remember, the cake might be an inch taller on one side than on the other, so measuring is important. You can create tiny slices to help guide you.
First, measure out the height of your layer. Then, make sure the dental floss stretches around the entire cake at the correct height.Finally, simply pull the dental floss tightly and it will slice through the entire cake.