3DM File Extension

Rhino 3D Model

File Type 3dm
Developer Robert McNeel & Associates
Popularity
4.7 (40 votes)
Application Flatland Rover
Category Web Files
Format Binary

What is a 3DM file?

Rhino 3D Model, identified by the 3DM extension, is a Web Files type and includes 283 files.

The Rhino 3D Model (3DM), created by McNeel, is one of file format they developed, and they also built programs to support them.

3DM file support extends to various operating systems, including Windows, Linux and Mac OS. When working with 3DM files, you can rely on 3 programs, including Flatland Rover, Autodesk Fusion 360 and Rhino 3D.

MIME types

text/vnd.in3d.3dml
model/vnd.flatland.3dml

Windows

Mac OS

Linux

How to open a 3DM file?

If you can’t open a 3DM file, it is usually because the necessary software is missing. To resolve the issue, select the right program from the list for your operating system. Then go to the official website of the developer, download the software, and install it.

When it comes to opening and working with 3DM files, Flatland Rover, Autodesk Fusion 360 and Rhino 3D are the top choices for users. To install the updated version of Flatland Rover, simply go to the Flatland site and download the installer compatible with all major platforms.

Once the process is complete, Flatland Rover should take over as the default application for 3DM files.

Set Flatland Rover as the default 3DM program

Changing Default Programs in Windows

Right-click on your 3DM file, then choose the "Open with" option and select "Choose another application" from the available options;
In the pop-up window, select the Flatland Rover application;
Check the "Always use this application" checkbox, and then click "OK" to apply the selected application as the default for opening 3DM files.

Change Default Program on Mac

Right click or Control + left click on the desired 3DM file;
Select "Open in application" and click "Other";
At the bottom of the window, you will find the "Enable" menu. Default, will be set to "Recommended Programs";
Choose "All Programs" in this menu and search for Flatland Rover. Check the box next to "Always open in app" to make it the default program.

Solve problems with 3DM files

Rest assured, any issues with 3DM files can typically be addressed with simple software adjustments. See the tips below for help.

Why does Flatland Rover stop responding or crash intermittently?

Flatland Rover crashes can be caused by outdated software. Keep your Flatland products up to date by installing the latest updates.

Restarting your computer will solve many common problems, which is why it’s the first thing you should do before changing any settings related to the software.

What are the best practices for repairing a 3DM file that has gone bad?

Use a data recovery program to open the damaged 3DM file and from the menu choose "Repair" function to start the repair process. Allow the recovery process to complete, which will automatically repair the damaged web files.

What are the warning signs that my 3DM file may be corrupted?

Common indications of damaged 3DM web files are:

Error messages appear during the course of working with the file;
Editing the archive in Flatland Rover results in slow or unresponsive behavior;
Opening the file results in an error or a failed attempt;
Unexpected expansion of the total size of the 3DM file;
Opening the file in Flatland Rover or other programs causes them to hang or crash;

How to edit a 3DM file?

To edit 3DM files, it is essential to install software that supports not only viewing but also editing the web files. Online 3DM editors provide limited functionality compared to full-featured software for Rhino 3D Model.

List of Top 3DM editors 2026

Based on the criteria above, here is a selection of 3DM editors you can use.

3DM Editor Software	Developer	Platforms	Overall Rating
Rhino 3D	McNeel	Windows, Mac OS, Linux	4.5 out of 5 (41 review)
Autodesk Fusion 360	Autodesk	Windows, Mac OS, Linux	4.1 out of 5 (38 reviews)
Flatland Rover	Flatland	Windows	4.1 out of 5 (43 reviews)

Convert to and from 3DM

If obstacles arise while working with a 3DM file, you may convert it to formats like DXF, DWG, OBJ, IGS, STEP or other similar types for smoother handling.

Keep in mind that converting a 3DM file may introduce some limitations, but the original format can often be restored.