Features

Everything you need between a model and a print

3D Fosil checks a model against your printer, slices it with full print settings in your browser, and helps you set up the print with AI, without installing anything.

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In short

3D Fosil is a browser workspace with a slicer of close to 600 settings that runs on your own computer, STL risk analysis, AI print setup, multiple copies, layer-based colour changes, automatic mesh repair, saved printers and a history of every G-code.

What you get

Slicer in your browser

Slice STL, 3MF and OBJ models with close to 600 print settings. Slicing runs on your own computer; phones and very large jobs fall back to our servers.

STL risk analysis

Fit on the bed, print time, filament weight and cost from a real slice, support share and a risk score with the reasons behind it.

AI print setup

AI measures overhang angles, bed contact, balance, thin sections and mesh health, then suggests orientation and settings with a reason for each.

Build volume check

Your printer's printable space is drawn around the model and turns red when anything sticks out, so oversized prints are caught before slicing.

Copies on one bed

Print up to 50 copies of a model in one G-code, laid out in a grid and centred on the bed.

Layer colour changes

Add filament changes at any layer and see the colour bands in the preview; the G-code pauses with M600 or M0 so you can swap filament.

Automatic mesh repair

Models with holes are sliced with their open outlines kept, and every slice is checked layer by layer for missing walls.

Toolpath preview

Step through layers and toggle walls, top and bottom, infill, supports and adhesion before you download.

Your printers, saved

47 printer profiles from 11 brands or your own custom printer, each with build volume, nozzle, material and start and end G-code.

History of every G-code

Every slice is kept with its printer, material, print time, filament and layer count; analysis reports are saved too.

How it works

Add your printer

Pick it from the printer library or enter a custom build volume, nozzle and start G-code.

Upload and place the model

Move, rotate and scale it in mm, cm or inches, add copies, or let AI choose the orientation and settings.

Slice, preview and download

Slice in your browser, check every layer and download G-code made for your printer.

At a glance

File formats	STL, 3MF, OBJ
Print settings	Close to 600
Where slicing runs	In your browser, with a server fallback
Printer profiles	47 models from 11 brands, plus custom
Copies per G-code	Up to 50
Colour changes	Up to 12 per print (M600 or M0)
Starting price	Free

Features: common questions

Do I need to install anything?

No. 3D Fosil runs in a modern desktop browser such as Chrome, Edge, Firefox or Safari. The slicing engine is loaded into the browser and cached for the next visit.

Can I print in more than one colour?

Yes, on a single-nozzle printer with layer colour changes: pick the layers in the G-code preview and the printer pauses there so you can load the next filament. Printers with several extruders or automatic filament changers are not supported yet.

What happens if my model has holes?

3D Fosil keeps the open outlines when slicing so no layers are dropped, then checks every layer against the model. If walls are still missing it warns you and offers to repair and slice again.