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jan_jes writes:

Researchers developed a[sic] multipurpose, fish-shaped microrobots — called microfish — that swim around efficiently in liquids, are chemically powered by hydrogen peroxide, and magnetically controlled.

They used an innovative 3D printing technology to develop these microrobots.

These proof-of-concept synthetic microfish will inspire a new generation of “smart” microrobots that have diverse capabilities such as detoxification, sensing, and directed drug delivery.

The technique used to fabricate the microfish provides numerous improvements over other methods traditionally employed to create microrobots with various locomotion mechanisms, such as microjet engines, microdrillers, and microrockets.

http://www.rtoz.org/2015/08/27/3d-printed-microfish-capable-of-removing-and-sensing-toxins/