.AMF

Introduction

AMF is an XML format for 3D printing, standardised by ASTM in 2011 and later as ISO/ASTM 52915. It was meant to replace STL: as well as triangles it records units, several objects, materials, colours, and a layout of objects on the build plate. Unlike STL, a mesh lists each vertex once and the triangles refer to it.

AMF saw little adoption. The industry largely moved to 3MF instead, though some slicers still read AMF.

Structure

The root element is amf, with a unit attribute such as millimeter. Each object holds a mesh, which has one vertices list and one or more volume elements made of triangles that refer to vertices by index. A volume can name a material, and constellation elements place copies of objects. The file may be stored inside a ZIP archive to save space.

<amf unit="millimeter">
  <object id="1">
    <mesh>
      <vertices>
        <vertex><coordinates><x>0</x><y>0</y><z>0</z></coordinates></vertex>
        …
      </vertices>
      <volume>
        <triangle><v1>0</v1><v2>1</v2><v3>2</v3></triangle>
      </volume>
    </mesh>
  </object>
</amf>

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