How are the transmission electron microscopy copper grids manufactered?

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Janez Zavašnik Popular answer

The Cu (or Ni, Mo, Au ...) support grid is electro-formed and etched. But the main part is the amorphous carbon coating, the metal grid is just for support. Short (shaky) video about "how is made" can be found here: https://youtu.be/u2auPtTtroM

Janez Zavašnik

Vladimir Dusevich

I just want to mention that carbon coating (carbon support film) is not "the main part", but optional part. Useful for some specimens, not used at all in a lot of other TEM applications.