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Which of the following is the correct file extension for an OBJ file?

easy📝 Factual Q3 of 15
3D Printing - STL and File Preparation
Which of the following is the correct file extension for an OBJ file?
A.gcode
B.3mf
C.stl
D.obj
Step-by-Step Solution
Solution:

  1. Step 1: Recall standard file extensions

    OBJ files use the extension .obj to identify 3D geometry files.

  2. Step 2: Differentiate from other formats

    .3mf is for 3MF files, .stl is another 3D format, and .gcode is printer instructions.

  3. Final Answer:

    .obj -> Option D

  4. Quick Check:

    OBJ extension = A [OK]
Quick Trick: OBJ files always end with .obj extension [OK]
Common Mistakes:
MISTAKES
  • Confusing OBJ with 3MF or STL extensions
  • Mixing file extensions with printer code files

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