Tried to make the hot wire template for cutting the outside of the (soon to be covered in foam) bowl. I thought that the best thing would be to run a single hot wire around the bowl to cut the shape evenly. So I used a template that was 1/2 an inch smaller than the finished size of the outside of the bowl. Using screws as standoffs I attached a bandsaw blade. Bringing us back to the final template shape. Connected to a car battery charger and it got hot. Hot enough to cut foam except the blade expanded when it got hot and deformed. Couple of hours work with only a lesson in metal dynamics to show for it.