Hot Wire Hot Wire Cutter, 30W 25cm Electric Hot Wire Cutter Foam Polystyrene Heat Cutting Engraving Pen for Model Making Artwork Creation(#3)

Great product. Heats up almost instantly and cuts through polystyrene easily, leaving a smooth edge. Remembered some advice from another reviewer of a similar product -don't force the knife. There is no need to do that. It will glide easily. Besides it might snap.