Free online IGES to AMF converter

Source format: IGES

IGES (Initial Graphics Exchange Specification) is a long-standing CAD interchange format used to move 2D and 3D engineering data between different design systems. It is common in mechanical design, product development, tooling, and legacy manufacturing workflows. IGES files often contain wireframes, surfaces, curves, and sometimes solid-related data, making them useful for exchanging geometry across CAD platforms.

Because IGES is widely supported but older, it is often used when sharing models with partners or when working with archived CAD data from older systems.

Target format: AMF

AMF (Additive Manufacturing File Format) is a modern 3D printing-oriented file format designed to describe objects for additive manufacturing. Compared with older mesh formats, AMF can store multiple materials, color, lattice structures, and more precise object metadata. It is intended for 3D printing workflows rather than general CAD editing.

AMF is useful when preparing models for printers or slicer software that supports it, especially when advanced material or color information is needed.

How to perform the conversion

The most practical way to convert IGES to AMF is to use CAD or mesh-processing software that can import IGES geometry and then export AMF. In many cases, the conversion is not a direct CAD-to-CAD translation but a geometry-to-mesh workflow.

Recommended workflow with FreeCAD:

1. Open FreeCAD and import the IGES file using File → Import.
2. Switch to the Part or Mesh Design workbench, depending on the model type.
3. If the IGES file contains surfaces or solids, convert or refine the shape as needed.
4. Create a mesh from the geometry using the mesh tools, choosing an appropriate mesh density for your printer or downstream use.
5. Export the result with File → Export and choose AMF as the output format if available in your FreeCAD build.

Alternative workflow with Blender:

1. Import the IGES model through a CAD import add-on or by first converting it in CAD software to a mesh-friendly format.
2. Check scale, orientation, and manifoldness.
3. Export using File → Export and select AMF if supported by your Blender setup.

If your CAD application does not export AMF directly, a common approach is to convert IGES to a mesh format first and then export to AMF from a tool that supports AMF output. The exact menu names vary by software, but the key steps are always: import IGES, tessellate or mesh the geometry, then export AMF.

Notes on quality, compatibility, or limitations

IGES is geometry-based, while AMF is mesh-based for additive manufacturing, so the conversion can involve loss of CAD precision. Curves and surfaces from IGES must be tessellated into triangles or other mesh elements, and the chosen mesh resolution affects print quality, file size, and smoothness.

Important limitations include:

• Not all IGES entities convert cleanly; complex surfaces, trimmed surfaces, or assemblies may need repair.
• AMF support is less universal than STL or 3MF, so verify that your slicer or printer software can open AMF files.
• Units and scale may need manual checking after conversion.
• Watertight geometry is important for 3D printing; non-manifold or open surfaces may cause export or slicing problems.

For best results, inspect the model after conversion, confirm dimensions, and test with a small print or preview before using the AMF file in production.