Open 3D Model Viewer – Free STL Viewer for Windows.

Looking to view 3D models in STL format? Open 3D Model Viewer fully supports STL files and 30+ other formats. Unlike other viewers, it is Open Source and free!

Download (v1.1, Windows 32 & 64 Bit)

Installer-less version (ZIP, Windows 32 or 64 Bit)

Import and export STL and 30+ 3D formats

STL (ASCII and Binary) is supported as import and export format. Other supported formats include OBJ, 3DS, BLEND, FBX, DXF, LWO, LWS, MD5, MD3, MD2, NDO, X, IFC and Collada (some of these are only supported as import format).

Intuitive User Interface

The Model Viewer has a tabbed UX so multiple scenes can be open at the same time. 3D views are split in up to four viewports. Different camera modes (orbit, FPS or axis-aligned) are available for each viewport. New files are loaded in the background.

Coming soon: Mesh repair for 3D printing

The current version already offers a handful of edit functions to fix common glitches such as inproper normal vectors, flipped UV coordinates (or textures) or degenerate geometry removal. Soon there will be 3D-printing specific tools to fix any issues that could impact 3D printing quality.