UNDERSTANDING FILE FORMATS
Choose the right file format for your 3D printing project. Each format has strengths and limitations.
FORMAT COMPARISON
STL
The most common format for 3D printing. STL files represent surfaces as triangular meshes. Perfect for most printing jobs.
3MF
Microsoft's modern format designed specifically for 3D printing. Includes color, texture, and material information.
OBJ
Common in 3D graphics and modeling. Supports textures via MTL files. Good for detailed visual models.
STEP
CAD-native format with precise geometry. Must be converted to mesh (STL/3MF) for printing. Best for engineering parts.
IGES
Older CAD exchange format. Still used in some industries. Requires conversion to mesh format for printing.
WHICH FORMAT TO USE?
STL is universal and works everywhere. 3MF offers better quality and metadata.
3MF is preferred for modern printers. OBJ works with texture files.
Export from CAD as STEP, then convert to STL for printing.
Best for detailed models with textures and complex geometry.
Only format that properly supports multiple materials in one file.
Convert IGES to STL using CAD software or online converters.
FILE PREPARATION TIPS
Ensure your file is in millimeters (mm). STL files don't specify units, so verify scale before uploading.
Use mesh repair tools to fix non-manifold edges, holes, and inverted normals before printing.
Reduce polygon count for large files. Balance detail with file size for faster processing.
Export from CAD at 1:1 scale. Avoid scaling issues by checking dimensions match your design.
3MF preserves color, texture, and material data better than STL for multi-part projects.
For new designs, export as STL first to verify geometry before using advanced formats.