.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.dae
COLLADA modelCollaborative Design Activity
An XML 3D interchange format created by Sony Computer Entertainment and now maintained by the Khronos Group. It holds geometry, materials, effects, skeletons and animation.
Exchanging models with older engines, SketchUp and Google Earth.
Opens in SketchUp, Maya, Cinema 4D, Quick Look on Mac
About DAE files