3MF is a 3D Manufacturing File Format. It is an open source format created by 3MF Consortium. 3MF is an XML-based data format with information about materials, colors, and other meta data.
The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert multiple 3MF files as once.
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