making the items on a basic 3D printer took from 41 percent to 64 percent less energy than making them in a factory

making stuff on a 3D printer uses less energy—and therefore releases less carbon dioxide—than producing it en masse in a factory and shipping it to a warehouse
 
3D printer work by melting filament, usually plastic, and depositing it layer by layer in a specific pattern. Free designs for thousands of products are available
 
making the items on a basic 3D printer took from 41 percent to 64 percent less energy than making them in a factory and shipping them to the US
 
Some of the savings come from using less raw material.
 
3D printed blocks can be made partially or even completely hollow, requiring much less plastic
 
the home manufacturer would be motivated to do the right thing and use less energy, because it costs so much less to make things on a 3D printer than to buy them off the shelf or on the Internet.
 
 
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