This kid is using an evolving technology to make a point.
So-called "3-D printing" is not a practical method for manufacturing in volume versus traditional manufacturing, or even CNC manufacturing. It is primarily a method for creating one-offs and mock-ups prior to full-scale production.
As the tech improves, it will become more flexible in terms of materials and durability, but mass manufacturing may never be practical, at least until true nanoscale molecular manufacturing fabs are perfected.
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