3MF, 3D manufacturing format, is used by applications to render 3D object models to a variety of other applications, platforms, services and printers. It was built to avoid the limitations and issues in other 3D file formats, like STL, for working with the latest versions of 3D printers. 3MF is relatively a new file format that has been developed and published by the 3MF consortium.
STL, abbreviation for stereolithrography, is an interchangeable file format that represents 3-dimensional surface geometry. The file format finds its usage in several fields such as rapid prototyping, 3D printing and computer-aided manufacturing. It represents a surface as a series of small triangles, known as facets, where each facet is described by a perpendicular direction and three points representing the vertices of the triangle.