What CAD File Formats Do People Use Most in Fusion 360?

Emily Suzuki Emily Suzuki February 10, 2022

3 min read

This post is also available in: Français (French) Italiano (Italian)

Autodesk Fusion 360 supports a wide variety of CAD file formats. Take a look at the five most popular supported Fusion 360 CAD files ones in this brief overview.


Computer-aided design (CAD) is a method of digitally creating 2D drawings and 3D models of real-world products. CAD, in recent decades, has replaced manual drafting – and for good reason. It’s much easier to design in a forgiving digital space where you can make revisions and edits without halting the entire project. In recent years, Autodesk has pushed the envelope even further with Fusion 360, an integrated cloud CAD package that includes:

But what makes Fusion 360 stand out from the competition? For one, Fusion 360 is a versatile platform that supports various CAD file formats. The five most used file extensions with Fusion 360 are:

Let’s take a look at these supported file extensions and see why the versatility provided by Fusion 360 is a game-changer for CAD users.

Autodesk Inventor Part File (.ipt)

The IPT file is a 2D or 3D model created in Autodesk Inventor. Autodesk inventor is a program used to design mechanical 3D prototypes. An IPT file typically contains a 3D part meant to be combined with other parts to form an assembly. When the parts are ready to be incorporated into an assembly, the resulting file extension is IAM (.iam).

The Standard for the Exchange of Product Data (.step)

STEP files are among the most accepted CAD formats and are an ISO 10303-2xx standard across several industries. STEP files contain three-dimensional models saved in a plain text format readable by Fusion 360. The text describes a model’s structure and is written in an ASCII format that adheres to the aforementioned ISO standard.

There are three major mechanical STEP file formats:

OBJ (.obj)

An OBJ file is a universal text-based 3D model format. OBJ files can house references to one or more .mtl files containing additional surface shading data. One downside to OBJ files is the file size. Because OBJ files have a simple format structure, the file size can become quite large when storing complex 3D objects.

Stereolithography (.stl)

STL is an interchange file format that houses universal 3D formats focused solely on surface geometry and shapes. STL files do not include colors, textures, or other attributes. STL files are acceptable for quick prototyping, 3D printing, and some CAM software applications; however, without support for color or other attributes, STL contains only simple data and thus only works well in basic situations.

SolidWorks (.sldprt)

A SLDPRT is a 3D image format used by SolidWorks CAD software. The file contains a 3D object or part that is eventually put into a single assembly (.sldasm) file. You can view SLDPRT files in a variety of applications like Adobe Acrobat. Fusion 360 allows for viewing and support of SLDPRT files.

Supporting Diverse File Types

The Fusion 360 cloud CAD platform enables engineers to collaborate and work remotely without having to worry about whether they will be able to access their project files or not. Engineers are able to use Autodesk Inventor (.ipt), STEP (.step), OBJ (.obj), STL (.stl), Solidworks (.sldprt), and many more file types within the Fusion 360 platform. 

Fusion 360 is a versatile platform that supports file extensions from other Autodesk products and software platforms like Solidworks. Fusion 360 combines CAD, CAM, CAE, and PCB software in one affordable package. 

Download Autodesk Fusion 360 to go from dream to done in no time.

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