A system developed by researchers at Spain's Public University of Navarre incorporates a robotic arm that generates sound waves to levitate, rotate, and move objects in order to build complex structures in mid-air without touching the parts.
The robotic arm, which employs 40-kilohertz sound waves, was used to build objects by manipulating droplets of glue or resin and small sticks.
After assembly, a beam of ultraviolet light was applied to set the glue or cure the resin.
The technique is similar to three-dimensional printing but can be used on liquids, powders, and hot or hazardous substances.
From New Scientist
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