Free Chrome extension
STL Viewer & 3D Print Cost Calculator
Open 3D files right in Chrome. Drag an STL, OBJ, 3MF or PLY file into the browser to rotate and inspect the model, check the mesh is watertight, measure its size and volume, and estimate what it will cost to 3D print — without installing desktop software or uploading anything.
3D model viewer
- Open STL (binary and ASCII), OBJ, 3MF and PLY files
- Drag and drop, use the file picker, or paste a link to an .stl file
- Right-click any .stl, .obj, .3mf or .ply link on a web page and choose “Open in STL Viewer” to preview a model before you download it
- Rotate, pan and zoom, wireframe mode, build plate grid and custom model colour
- Save a PNG snapshot of your model
Mesh check & measurements
- Dimensions (X × Y × Z) in mm, with file units (mm, cm, inch) and scale %
- Volume (cm³), surface area (cm²) and triangle count
- Watertight check that finds open edges and non-manifold edges before you send the file to your slicer
3D print cost calculator
- Choose from common filaments or resin
- Set your filament price per kg, infill % and quantity
- Get material weight in grams, filament length in metres (1.75 mm) and material cost in your currency
- Remembers your settings
Private by design
- Your files are processed locally in your browser and never uploaded
- Works offline
- No account, no ads, no tracking
- Only asks for access to a website when you choose to open a model from that site
No 3D printer? Get it made
No printer, or the part is too big for yours? Post it as a job on The Spool List, a marketplace that connects buyers with makers who own 3D printers, CNC machines and laser cutters. It’s free for buyers, and every payment is held safely by The Spool List until the job is delivered.
On MakerWorld, Printables and Thingiverse model pages, a small “No printer? Get this made” card lets you post that model as a job in one click. The viewer’s “Get quotes from makers” button fills in the file name, size, volume and quantity for you.
Questions
Is the STL viewer free?
Yes. The extension is free, with no account and no ads.
Are my 3D files uploaded anywhere?
No. Files are opened and measured locally in your browser and are never uploaded. The extension also works offline.
Which file types does it open?
STL (binary and ASCII), OBJ, 3MF and PLY.
What does “Get this made” do?
On MakerWorld, Printables and Thingiverse model pages, a small card lets you post that model as a job on The Spool List in one click, so makers with 3D printers can quote on it. You can hide the card on any site or switch it off in the extension’s options.
Does it work in Edge or Brave?
It is published on the Chrome Web Store. Chromium-based browsers that install Chrome Web Store extensions can usually install it from the same listing.