Free Online 3MF Viewer

View 3MF files in 3D. Supports multi-part assemblies. Works in your browser.

3MF (3D Manufacturing Format) is the modern replacement for STL in 3D printing. It supports multi-part assemblies, colour, material properties, and print settings in a single ZIP-based file. PrusaSlicer, Bambu Studio, and Cura all export 3MF.

GeometryViewer opens 3MF files directly in the browser. Multi-part assemblies are displayed with each component in place. The model is then merged for AR viewing so you can place the complete assembly in your real environment.

Use cases

Preview PrusaSlicer project files
Check multi-part assemblies
View 3MF exports from CAD software

GeometryViewer also opens STL, OBJ, GLTF, GLB, and 3MF — all in the same viewer.

Open any 3D file →

Need 3D models to view? ModelDirectory.org has thousands of free STL, OBJ, GLTF, and 3MF files — open any of them here in one click.