How to Make a Hot Knife to Cut Plastic

Written by guy gardner
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How to Make a Hot Knife to Cut Plastic
Make your own hot knife for cutting plastic. (soldering image by Bube from

A knife can be a clumsy tool when it comes to cutting plastic. Whether you are making some simple cuts to your plastic model parts or attempting something more difficult, there is a better tool for the job. A hot knife can combine the cutting edge of a knife with the heat to reduce plastic to the consistency of butter. By building your own hot knife, you can give yourself a faster, more precise tool.

Skill level:

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Things you need

  • Soldering iron
  • Soldering iron tip
  • Pliers
  • Hammer

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  1. 1

    Place a soldering iron tip on your work table. Hold the base of the iron tip in place with pliers.

  2. 2

    Hammer one side of the soldering tip flat until you get a cutting edge. This will be your hot knife blade.

  3. 3

    Place the converted soldering tip into the end of the soldering iron and turn on the soldering iron.

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