When people need this
A model prepared in a modern slicer or downloaded from a print-focused library arrives as 3MF, and the machine, service or firmware in front of you wants STL.
3MF to STL converter
3MF was designed to replace STL and is better in every technical way — real millimetres, colour, several objects per file. The catch is that plenty of older slicers, printers and print services still accept only STL.
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Try generation →What to check in the result
3MF records real-world dimensions and they survive the conversion, so nothing has to be rescaled. Colour and per-object assignment are lost, because STL has no place for either.