Check out this crazy claw mechanism cut with looks like a CNC machine out of styrofoam. I'm guessing that might be a spinning spiral-toothed coping saw blade doing the cutting...or is that a hot wire of some sort? I am not sure. Either way, I love variation in the claw's motion caused by the two different gears working together.
My guess would be that it is a hot wire. If it was a spiral toothed blade you would be seeing lots of flying bits of foam in the air.
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