Private by design
The 3MF is unzipped in your browser and never uploaded, so customer projects stay on your device.
3MF Viewer
Open 3MF files from Bambu Studio, PrusaSlicer and Cura without installing a slicer. See every object, size and filament.
Loading 3D preview
Drag to rotate
Open a file to see its size, triangle count and whether it is watertight.
Opened in your browser. Files are never uploaded.
Continue with your 3MF
Pick the next tool for what you want to do with the project.
How to open a 3MF file online
Open the project, look over every object, then take out the meshes you need.
- 1
Open the 3MF
Drop a 3MF project or model file, including Bambu Studio and OrcaSlicer projects.
- 2
See every object
All objects appear on the plate where they were placed. Rotate and zoom to inspect them.
- 3
Take the meshes out
Download the geometry as STL if you need it in a tool that does not read 3MF.
Why use this 3MF viewer
A look inside slicer projects without installing a slicer.
Real size
Read from the file's own unit, whether it was saved in millimeters, inches or microns.
Triangle count
The combined mesh density of every object in the project.
Watertight check
Open and non-manifold edges across the objects, before the slicer complains.
Volume and filament
Total volume and a solid PLA estimate for the whole plate.
Wireframe view
Switch on wireframe to see how finely each object is meshed before the project goes to the printer.
What's inside a 3MF file
3MF was designed for 3D printing from the start. Here is what that means in practice.
A zip of XML files
Rename a .3mf to .zip and you will find the model as XML, often with a thumbnail and slicer settings. It is an open standard from the 3MF Consortium.
The unit is written down
Unlike STL, the model states its unit: micron, millimeter, centimeter, inch, foot or meter. So a 3MF opens at the size it was saved.
Several objects, already placed
One file can hold many objects with their positions on the plate, which is why slicers save whole projects as 3MF.
Slicer extras ride along
Bambu Studio, OrcaSlicer and PrusaSlicer add plates, painted colors and print settings. The viewer reads the geometry and ignores the rest.
Who uses a 3MF viewer
Slicer projects travel between people, printers and model sites. These are the people who open them.
Bambu and Prusa owners
Look at a project on a laptop or phone that has no slicer installed, before sending it to the printer.
Model downloaders
Check what a 3MF from MakerWorld or Printables contains, and how big it is, before you slice it.
Print farms and services
Open a customer project on any computer to count objects and estimate filament before quoting.
Schools and makerspaces
Check student projects on shared computers where installing a slicer is not an option.
3MF viewer questions
Answers about slicers, colors, Bambu projects, privacy and STL export.
How do I open a 3MF file without a slicer?
Drop it onto this page. The 3MF viewer runs in your browser on any computer, tablet or phone.
Does it show colors and print settings?
The viewer shows the geometry of every object. Painted colors and slicer settings stay in the file but are not displayed.
Can it open Bambu Studio projects?
Yes. Bambu Studio and OrcaSlicer keep their models in a standard 3MF structure that the viewer reads.
Is my file uploaded?
No. It is unzipped and read in your browser and never leaves your device.
Can I get STL files out of a 3MF?
Yes. Download STL saves the whole plate; 3MF to STL can also split each object into its own file.