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An STL stores triangles and nothing else — not even a unit of measurement. A 3MF is a zip archive that records units, colour and separate objects. Here is every difference that changes what comes off the printer.

There is no STL-to-G-code converter, and any site offering one is guessing at your printer. G-code is a list of machine moves, not a shape — here is what actually produces it, and why going back the other way loses the model.