When people need this
Editing a model that only exists as a 3MF, or pulling a print-ready arrangement into a renderer for a presentation image.
3MF to OBJ converter
3MF is a print format that happens to store real dimensions, colour and several objects at once. OBJ is an editing format. This conversion takes something prepared for a printer and hands it back to a modelling package.
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Try generation →What to check in the result
Millimetre dimensions from the 3MF are carried over as plain numbers, and OBJ records no unit — so 1.0 in the result means one millimetre, not one metre.