How to Convert a GLB Model to STL for 3D Printing

GLB is built for screens and STL for printers. Converting the file is easy. Making the result printable is the real work, because a model designed to look good on screen doesn't have to be a solid object.

What you lose in conversion

STL holds geometry only. Colours, textures, materials, animation and the scene hierarchy are all dropped. Any detail that came from a normal map rather than real geometry disappears too. A printed copy of a game asset is often smoother and plainer than it looked on screen.

The conversion

1. In Blender: File → Import → glTF 2.0, select your .glb.
2. Select the parts you want to print and join them (Ctrl+J).
3. Apply transforms (Ctrl+A → All Transforms).
4. File → Export → STL. Tick "Selection Only" and "Apply Modifiers".

Making it printable

Scale

Game and web models are usually in metres, and slicers assume millimetres. A 0.3-unit model may arrive as a 0.3 mm speck. Set the size you want in the slicer, or scale in Blender before exporting.

Holes and open surfaces

Screen models are full of open edges: eyes that are separate floating spheres, single-sided leaves and flags, missing undersides. Run Blender's 3D-Print Toolbox "Check All" and read what manifold means. For a quick fix, a Remesh modifier in Voxel mode wraps the model in a watertight skin.

Thin parts

Swords, antennae, fingers and leaves that are fine on screen may be thinner than your nozzle. The toolbox's Thickness check finds them. Thicken them with a Solidify modifier, or scale the whole model up.

Flat base

Cut or flatten the bottom so the model sits on the bed. Bisect (in Edit Mode, Mesh → Bisect) with "Fill" ticked makes a clean, closed base.

Skip the conversion when you can

If you're starting from a picture rather than a finished model, our image to STL tool builds a watertight relief or lithophane directly, with no repair needed. And the low-poly engine in text to 3D exports STL alongside GLB, built from closed primitives.

Practise on something free

The CC0 netsuke scan and the chess king in our library both make good first conversions.