One platform for
STL risk analysis, pro-grade slicing
and production-ready G-code.
Upload STL, 3MF or OBJ files, validate geometry before slicing, tune printer settings, and generate cleaner G-code with a workflow built for serious 3D printing.
Move from file upload to printer-ready output with analysis, profile control, support planning, and G-code generation in one place.
Prepare models, review layer strategy, control supports, and keep every slicer decision inside one focused 3D printing workspace.
From model file to printer-ready G-code, in one browser tab
3D Fosil is a web-based 3D printing platform that checks STL, 3MF and OBJ models against your own printer and slices them into printer-ready G-code with a proven open-source slicing engine, without installing desktop software.
STL risk analysis
Measure dimensions, volume and overhangs, check that the mesh is watertight and that it fits your printer, then get print time, filament and cost from a real slice.
Pro-grade slicing
Slice with close to 600 print settings from Basic to Expert visibility. Derived values update automatically when you change a parent setting.
Your printers, saved
Save printer setups with build volume, nozzle, material and start/end G-code. Every analysis and slice uses the machine you choose.
Layer-by-layer preview
Inspect walls, infill, skin, supports and adhesion in a 3D toolpath preview before you download the G-code.
Powerful Features
Everything you need to perfect your 3D prints
Every core workflow is designed to reduce failed prints, material waste, and operator guesswork before the job reaches the machine.
STL Risk Analysis
Detect potential print failures before wasting time and filament. Get risk scores, wall thickness warnings, and cost estimates.
Pro-Grade Slicing
Close to 600 print settings with automatic derived values, sliced for your saved printers.
Cost Estimation
Calculate exact filament usage, print time, and costs before starting your print job.
Optimization Tips
Get AI-powered suggestions to optimize your print settings for better quality and faster prints.
How It Works
Upload your STL, 3MF or OBJ file
Check fit, supports, time and cost for your own printer
Get actionable insights and fix recommendations
From model to G-code
Validate an STL against your own printer before printing, then slice it with the full set of print settings into ready-to-print G-code.
Built around how you print
3D Fosil compared with a desktop slicer
Both turn models into G-code. The difference is where you work and what happens before slicing.
| Capability | 3D Fosil | Desktop slicer |
|---|---|---|
| Runs in the browser, nothing to install | Yes | No |
| Print settings | Close to 600 | Yes |
| Pre-print risk score with reasons | Yes | No |
| Saved printers across devices | Yes | Per computer |
| Analysis history | Yes | No |
| Works offline | No | Yes |
Simple Pricing
Start free, upgrade when you need more
Free
- 10 tokens per month (1 STL analysis)
- 2 saved printers
- 5 history entries
- Full print settings (close to 600)
- G-code export
Starter
- 150 tokens per month (~15 STL analyses)
- 10 saved printers
- 20 history entries
- Full print settings (close to 600)
- G-code export
Maker
- 400 tokens per month (~40 STL analyses)
- 10 saved printers
- 20 history entries
- Full print settings (close to 600)
- G-code export
Pro
- 1,000 tokens per month (~100 STL analyses)
- 10 saved printers
- 20 history entries
- Full print settings (close to 600)
- G-code export
Studio
- 2,500 tokens per month (~250 STL analyses)
- 10 saved printers
- 20 history entries
- Full print settings (close to 600)
- G-code export
Token add-ons
Need more this month? Add-ons are available with any paid package. Add-on tokens never expire; if your package ends they wait until you renew.
Frequently asked questions
What is 3D Fosil?
3D Fosil is a web-based 3D printing platform that checks STL, 3MF and OBJ models against your own printer and slices them into printer-ready G-code with a proven open-source slicing engine, without installing desktop software.
How does 3D Fosil slice models?
3D Fosil slices on its servers with a proven open-source slicing engine and close to 600 print settings. Derived values such as wall speeds and infill line distance are calculated from the settings you change, so the slice always matches your choices.
Which file formats can I upload?
You can upload STL, 3MF and OBJ files. 3MF and OBJ models are converted to a single mesh in the browser before slicing.
Which 3D printers are supported?
3D Fosil ships with profiles for printers from Creality, Prusa, Anycubic, Elegoo, Sovol, Artillery, FlashForge, Qidi Tech, Voron, Raise3D and Ultimaker, and you can add a custom printer with your own build volume and start G-code. Bambu Lab printers are not supported yet.
Is 3D Fosil free?
Yes. The Free package includes 2 saved printers, 5 history entries, full print settings, G-code export and 10 tokens per month, enough for one STL analysis. Paid packages start at $4.99 per month.
What are tokens used for?
Tokens pay for analysis features. An STL analysis costs 10 tokens. Monthly package tokens renew with each 30-day period. Add-on tokens never expire and can be used while you have an active paid package. Tokens are refunded automatically if an analysis fails.
Does 3D Fosil send G-code to my printer?
Not yet. 3D Fosil produces a G-code file that you download and print from an SD card, USB or your printer's web interface such as OctoPrint, Mainsail or Fluidd.
Check your next model before it reaches the printer
Start free with 2 saved printers, full print settings and one STL analysis every month.
Create a free account