Although called flying 3D-Printers, these quad and hexacopters don't actually build anything in the same way a traditional 3D printer does. They're solely capable of spitting out foam that they can use to repair buildings, pick up potentially hazardous waste from clean-up areas and (weirdly so) make their own nests on trees in order to recharge.
In a video demonstration, a quadcopter (a drone with four rotors) can be seen printing a sticky foam substance onto a small block, before flying away.
A hexacopter (which has six rotors) then takes the quadcopter's place, landing on the sprayed object and waiting for the foam to set.
Then the hexacopter flies off, with the foreign object attached to its underbelly.
The researchers hope this process will be particularly useful for removing hazardous materials, such as nuclear waste.
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