Open the Online STL Slicer Preview — Layers, Print
Slice an STL in your browser: scrub through layers showing walls, solid skin and infill, and get an estimate of print time, filament length.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
A 20 mm tall, 20 mm diameter cylinder at 0.2 mm layers, 2 walls, 4 top/bottom layers and 20% infill is 100 layers and uses roughly 3 g of PLA with a print time around 15–20 minutes at 60 mm/s.Open the Online STL Slicer Preview — Layers, Print
Illustration. Open the tool for the real thing.
See it in action
Sample input: File = sample.stl
What is the Online STL Slicer Preview — Layers, Print?
Before downloading a model or committing to a long print you often just want to know: how long will it take, how much filament will it use, and what will the layers look like? This tool slices your STL into true horizontal layers in your browser and lets you scrub through them with a slider, showing for each layer the outer walls, the solid top/bottom skin and the sparse infill, next to a 3D view of the model cut at the same height.
From your layer height, line width, wall count, infill percentage, top/bottom layers, speed and filament, it estimates print time, filament length and weight, and cost. The slicing itself is exact; the walls/skin/infill split is estimated from layer areas and neighbouring layers, so expect time within about ±20% of a real slicer — and you can enter a calibration factor from one known print to tighten it. It is not a G-code generator and does not add supports; it is for planning and previewing.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Contours from your mesh at every layer, with open-contour detection.
Colour-coded per layer with a synchronised 3D section.
Based on your own settings, with a calibration factor.
See where material is used along the height of the part.
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
How it compares
A plain look at this tool next to the usual alternative.
| This 3d tool | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
Does this create G-code?
No — it is a preview and estimator; use your slicer for G-code.
How accurate is the time?
Typically within ±20%; calibrate with one known print.
Does it include supports?
No. Use the overhang checker to see where supports are needed.
Is it private?
Yes — slicing happens in your browser.
How do I use the Online STL Slicer Preview — Layers, Print?
1. Drop in the STL (it slices automatically). 2. Adjust layer height, walls, infill and speeds. 3. Scrub the layer slider and watch the 3D section follow. 4. Read the time, filament and cost estimates.
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Try the Online STL Slicer Preview — Layers, Print now
Slice an STL into layers, scrub through them and estimate time, filament and cost. Free to use.
Try it free