You need a wire fdm machine (also called wire edm).

Its not cheap and its not small, especially when you need that kind of precision you're going to need a real (industrial) one.

Better ask a shop to produce for you, you can provide the CADs to them.

Well maybe you can build your own using cheap CNC like an 3D-printer paired with a generator and bath etc, but achieving accuracy could be a PITA.

https://en.wikipedia.org/wiki/Electrical_discharge_machining