A hot wire cutter as the one I described here only cuts in a straight line. Now I wanted to integrate some installation tube in my styrofoam. So I had to cut grooves into the foam. Cutting them with a knife won’t give a good result and so I had to find a new way to get the right shape. The idea was to bring a piece of wire in the shape I wanted to cut out of the foam and then to slide it through the foam.
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