Ok, this isn't really a 'robot', but the creative application of technology to solve a problem facing most people on the planet at one time or another during their lives really impressed us. Yoshino Kinzoku created the Kriko One-Hand toilet paper cutter.
Thinking out of the box, Kiriko's creator realized that all toilet paper on the market has to be formulated to easily dissolve in water. So the device doesn't actually 'cut' the paper as much as it 'melts' it. Our hat's off to Yoshino Kinzuko for this simple yet elegant design solution.