Few days ago I had shared my experience with 3D printing. Today saw something very similar.
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This thing may not matter much for say someone who's making earphones or microwave ovens as there isn't much to tinker with but for defence and aerospace this thing becomes substantial. The electronics in a missile may need to go through tens of different iterations before it's finalized. And being a sensitive technology you don't even have the luxury of bringing in China in the equation.
Just manufacturing itself is extremely tough here, let alone proper R&D