.amf
AMF modelAdditive Manufacturing File Format
An XML format for 3D printing, published by ASTM in 2011 and later adopted by ISO. It adds curved triangles, colours, materials and lattices to the plain mesh idea of STL.
Multi-material and colour 3D prints in slicers that support it.
Opens in PrusaSlicer, Slic3r
About AMF files.3mf
3MF model3D Manufacturing Format
A ZIP-based 3D printing format from the 3MF Consortium, founded in 2015 by Microsoft and others. Unlike STL it keeps units, colours, materials and several objects, and can carry print settings.
Ready-to-print projects with colours, multiple parts and printer settings.
Opens in PrusaSlicer, Bambu Studio, Cura, Windows 3D Builder
About 3MF files