Convert IGS (IGES) to STL for 3D Printing
Turn an IGES CAD model into a printable STL mesh. IGS and IGES are the same format — just different file extensions — commonly used for exchanging surface and curve data between older CAD systems.
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Why Convert IGS to STL?
IGES is one of the oldest CAD exchange standards, still widely used for exporting surface and curve geometry from mechanical CAD systems — but like STEP, it stores exact mathematical surfaces, not a mesh a slicer can use.
Converting tessellates those IGES surfaces into a triangulated mesh, ready to import directly into any slicer for 3D printing.
Because IGES predates STEP and represents surfaces slightly differently (as trimmed surface patches rather than a unified boundary representation), tessellation quality can vary more between different exporting CAD tools than with STEP files — worth a quick visual check of the resulting mesh before printing.
How to Convert IGS to STL
- Upload your .igs or .iges file.
- MiConvert tessellates the surface patches into a triangulated mesh.
- Download the converted STL file.
- Check the mesh for gaps in your slicer’s repair tool if printing fails.
Key Conversion Features
- Tessellates IGES surface and curve geometry into a print-ready STL mesh
- Supports both .igs and .iges file extensions (the same underlying format)
- No CAD software installation required
- Output ready to import directly into any STL-compatible slicer
- Free for files up to 50MB, 100MB for registered accounts
Video Tutorial
Detailed guide on how to convert IGS files to STL quickly, for free, and without losing original quality. Perfect if you need to process file formats, reduce size, or upload files to systems that only
Frequently Asked Questions
What’s the difference between IGS and IGES?
None — they’re the same format. IGS is simply the 3-letter file extension some CAD software defaults to for legacy Windows compatibility.
Why might there be small gaps or overlaps in the converted mesh?
IGES represents a model as a collection of individual trimmed surface patches rather than a single unified solid, so poorly-stitched patches in the original file can occasionally produce small gaps in the tessellated mesh — check for this in your slicer’s mesh-repair tool if printing fails.
Should I use STEP instead of IGES if I have a choice?
STEP generally produces more reliable, watertight tessellation since it represents a unified solid rather than separate surface patches — if your CAD software can export either, STEP is usually the safer choice for 3D printing.
Is the mesh resolution fine enough for detailed prints?
Yes — tessellation uses a fine tolerance suitable for standard FDM and resin printing.
Do I need CAD software to convert an IGES file?
No — the conversion happens entirely on our servers from your uploaded .igs or .iges file.