The wire can modify to any shape for cutting.

Since it is powered by 2 AAA battery (quite powerful, u can use 1 battery),

it will melt the foam before it touch it, so the hot-wire will not change it's shape during "cutting".

the nylon tie in the front stop the battery holder and the screw at the tail make a ring for hanging in tool-shelf.

Using hot-air gun to soften and bend the PVC as u like.

** Please remind that u need to bend PVC and cut foam in well-ventilated area.

U can see how it works in this video (0:43).

Also, U can use this knife to make a large stamp !!

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More by kokpat:MeArm - Servo Supporter Simple PS4 Controller Dock Small Paper Lamp 
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