Tools · 3D Converter

Convert GLB to STL for 3D printing

Slicers expect one mesh in millimetres with Z pointing up. The converter merges all visible parts into one binary STL, scales it from metres to millimetres, turns it to Z-up, puts it on the build plate and checks whether the mesh is watertight.

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Drop a file to see it here.

Convert to

FBX is not offered as output: browsers cannot write clean FBX files. Every Grab3D library model comes with a ready FBX download. Browse models

3D printing preset: millimetres, Z-up, origin at the bottom center

STL stores geometry only. All visible parts are merged into one binary STL.

Up axis Unit

Origin Recompute normals (smooth, sharp edges above 30°) Simplify materials (base color and color texture only) Bake colors and textures into vertex colors

Read the source as

Up axis of the source Unit of the source

Auto uses the file information: STL and 3MF are millimetres Z-up, FBX uses its unit scale, everything else metres Y-up.

How it works

Drop a GLB, or any other supported format.
Keep the 3D printing preset on: millimetres, Z-up, origin at the bottom center. Check the size in the info panel.
Convert and read the check. Open edges are holes your slicer has to repair. Download the STL.

What is kept and what to watch

STL stores geometry only. Colors, textures and materials are dropped.
Parts are merged into one file, not fused: overlapping parts stay separate shells. Most slicers print that fine.
Game and scan models are often not watertight. Repair them in your slicer or a mesh tool before printing.

Input and output: examples from the library

Two library models show what the GLB to STL converter writes. Each link opens the model on this page with the 3D printing preset already on.

Human Skull
Input
Human Skull: a detailed anatomy model with 799,999 triangles in the full download. The link loads its lighter web preview.
Output
One binary STL in millimetres, Z up, placed on the build plate, plus the check that counts open edges and edges shared by more than two triangles.
Open this example Model page
Coffin
Input
Coffin: a Lightweight prop made of separate parts (box and lid) with 2K textures.
Output
Both parts in one STL file as separate shells. Colours and textures are dropped because STL stores geometry only.
Open this example Model page

What it does not do

An STL export does not prove that a model is printable. The check finds holes and bad edges, it does not test wall thickness, overhangs or tiny details.
Game models are made for screens: thin parts, open backs and overlapping pieces are common. Repair and scale them in your slicer before you print.
The library links use the web preview. For the full resolution mesh, download the GLB from the model page and drop it here.

Other conversions

Frequently asked questions

Is my STL printable?

The converter counts open edges (holes) and edges shared by more than two triangles. With zero of both the mesh is watertight. Wall thickness and overhangs are not checked, your slicer shows those.

Why is the model tiny in my slicer?

The file was written in metres. Turn on the 3D printing preset or set the unit to millimetres before converting.

Can I scale the model to a print size?

The converter keeps the real size of the model. Scale it in your slicer, which also shows print time and material use.