If you do it wrong, cutting through foam can be a spectacularly messy job. The serrated teeth of a saw blade have a tendency to tear and rip up foam, sending little foamy bits floating into the air. And then those little bits cling to everything and are almost impossible to sweep up. Thankfully, there’s a simple way to create a tool that cuts through foam without ripping it up. Before attempting to cut the foam take a well-used jigsaw blade and, holding it with a pair of locking pliers, grind off the the teeth and create a smooth knife edge. Your jigsaw will give you a nice, clean cut through foam every time.
Check out the video below to see the tip in action.