A simple robotic chimney sweep

When I first looked at this it was not what I was expecting.  I thought it was a robot hung from a rope that raised/lowered it.  Nope, it crawls along the chimney with 2 brushes.  Me…I would be a bit worried about it getting stuck.

http://www.instructables.com/id/Merry-the-Chimney-Sweep-Robot/

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