I feel like this is a pretty good ELI5 comparison, sorta.
I have a network rack at home and a router I wanted to mount into it for space saving. The brackets purchased from the company were $100, so I decided to 3d print my own.
I started taking measurements, getting the rough idea of what I wanted it to be. Designed it in Fusion360, and then 3d printed it. It fit but was a bit weaker than I wanted. So I increased the thickness of everything. Printed it again. It fit well but the holes were a little bit off from where I wanted them aesthetically/functionally. Fixed the locations. Printed it again. Everything fits great, but the router is a little bit back heavy so the brackets are slightly twisting and are fine now but long term maybe not. So I designed a small addition to the bracket that went underneath it and supported the router. Printed it. Everything fits great and now it’s in use on the rack.
This is essentially research & development.
Idea, design, produce, test, fix, test, fix, test, fix, test, fix, production, release.
Mine is very minimal, compared to a chip with all the intricacies involved so scale it times 100000 and bam you’ve got $10 billion in R&D.
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