Draw machine arc (cut) lines

In the slices tab, you can use the keyboard shortcuts (B, T, A) to have the program draw the cut lines that the machine will make prior to cutting.

After you select the B, T, and A keys, you will get a display like so:

These lines essentially display how the disk blade will interact with the foam as the design gets cut out. These lines can be altered by their angle in the machine parameters tab: