File guide
Which file format do you need for 3D printing?
A 3D printer does not normally print a CAD design file directly. The model is exported to geometry that slicing software can read, then converted into machine instructions.
Written by: Fen3D Editorial Team · Published: · 5 min read
Common file formats
STL has the widest support. OBJ can carry color and texture information. 3MF is a modern option that stores units, materials, and production data more reliably.
- STL: Simple and widely supported geometry
- OBJ: Models that need color or texture data
- 3MF: Preserving units and production information
- STEP: Precise CAD geometry that may need editing
Is your file printable?
The model should form a closed volume without holes, inverted faces, or overlapping geometry. Very thin walls may fall below the limits of the selected production technology.
Before sending the file
State the unit and final dimensions. Name multiple parts in separate files and tell the maker about critical tolerances such as assembly clearances.