cold welding could decrease energy use in 3d printing

according to media, 
if two metals of the same type touch in vacuum, 
they fuse together, 
because no energy is required, 
this could decrease energy consumtion of small scale 3d printing on earth 
and large scale 3d printing in space, 
inside small vacuum chambers metal powders could be poured while fusing together to form small objects 
and in space metal powders could be poured while fusing together to form large objects, 
if possible transistors or even entire computer chips could be produced by inside a vacuum chamber placing metal atoms near each other so that they fuse into a desired structure 

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