The resources listed here are geared for prototyping that allows rapid iteration of designs and ideas. From electronics prototyping (Tempo Automation) to mechanical (Fictiv). Having been to Shenzhen for manufacturing, it is absolutely great once you get to large volume - you can't beat the robust ecosystem anywhere. For initial runs of designs (quantity 1-10 of something), TIME is absolutely key: dealing with Shenzhen takes extensive communication and long lead times for each production run that a startup or even a big company can't afford.