There are printed resins with fillers, like metals or carbon materials. There are printable metals. That gives us insulating plastics, conductive and semiconducting plastics, and metals. So why can’t you print a transistor? 10 um transisters (the limit for some SLA, though FDM and SLS are less precise) are useful for lots of basic functionality. There are also photopolymer printers with 30 nm resolution (Nanoscribe). Right now none of them are useful electronically, but you can make optical metamaterials that way.
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