Open an STL, OBJ, 3MF or PLY file to see it in 3D, measure it, check if it fits your printer and estimate how much filament it needs. Files are read on your device and never uploaded.
Drag to rotate, right-drag to move, scroll to zoomDrag to rotate, pinch to zoom, two fingers to move
How to use the STL viewer
- Open your fileDrop an STL, OBJ, 3MF or PLY file on the viewer, or tap Choose a file on your phone.
- Look around the modelDrag to rotate, scroll or pinch to zoom, and turn on wireframe to see the mesh. Save an image to share it.
- Check it before printingRead the exact size, see which printers it fits and how much filament it needs.
What is an STL file?
STL is the most common file for 3D printing. It describes the outside of a model as thousands of small triangles. It holds the shape only, with no color, material or units.
Every slicer opens it, including PrusaSlicer, Bambu Studio, OrcaSlicer and Cura.
Check before you print
A quick look saves failed prints. Make sure the size is what you expect, the model sits flat on the plate and it fits your printer.
A high triangle count means fine detail, but also a heavier file that slices slower.
Size, volume and weight
Size is the box around the model in millimeters. Volume is the space it fills if printed solid.
Printed parts are mostly hollow inside, so the filament estimate uses your infill and a 1.2 mm shell instead of the full volume.
Frequently asked questions
Is my file uploaded?
No. Your file is opened by your browser on your own device and never sent to our server, so you can safely check models you haven't shared yet.
Which files can I open?
STL (binary and ASCII), OBJ, 3MF and PLY. 3MF project files from Bambu Studio, PrusaSlicer and OrcaSlicer open too. PLY files from 3D scans need faces; a point cloud without a mesh can't be shown.
Why is my model lying on its side?
3D printing tools treat Z as up, while Blender and game engines often use Y. If your model looks rotated, change Up direction to Y-up. Many slicers will lay it flat for printing anyway.
Why does my model look tiny or huge?
STL files don't store units, so a model made in inches or centimeters can open at the wrong size. If the size looks wrong, change the units and the size, volume and printer check update right away.
Will my model fit my printer?
The printer check compares your model with the build size of popular printers. Fits on its side means it fits if you rotate it before printing. If it's too big, it shows how far to scale it down, or you can split the model into parts.
How much filament will my model use?
Pick your material and infill and the viewer estimates the weight, assuming 1.2 mm walls. Supports and brims add more. To turn it into a full price with electricity and failed prints, use the 3D print cost calculator.
Can I see colors and textures?
No. STL files hold only the shape, and the viewer shows every file in one color you can change. Painted 3MF and textured OBJ files open as plain geometry.