Even if you don’t want to build an unravel sweater machine you may have as much fun as I had looking at the video :)
By the way, it’s no joke, the unravel sweater machine can be used by charity projects where they unravel old sweaters to re-use the yarn.
Unravel Sweater Machine (National recognition for design with a novel take on recycling)
There is a link to the video: Imogen Hedges
via: Pedal-Powered “Un-knitting” Machine Unravels Sweaters to Recycle Yarn