OBJ

Also known as: OBJ File, Wavefront OBJ

beginner File Formats

A 3D model format that supports colors and textures, often used with MTL files.

OBJ (Wavefront OBJ) is a 3D model format that supports geometry, colors, and textures. More capable than STL but less purpose-built for 3D printing than 3MF.

Features

  • Geometry data (vertices, faces)
  • Texture coordinates
  • Material references (via MTL file)
  • Widely supported

OBJ vs STL

FeatureOBJSTL
ColorYes (via MTL)No
TexturesYesNo
UnitsNoNo
ComplexityHigherSimple

Common Use

  • Import from 3D modeling software
  • Multi-color prints (with MTL)
  • When STL loses texture info

In 3D Printing

Most slicers support OBJ import. Useful when you need color information preserved, but 3MF is generally preferred for modern workflows.