Why is the structure all one block type?

Because .stl carries no colour data at all. The palette you pick in the preview panel is the sole source of block choice — export your model as .obj or .glb instead if you need its textures.

How do I place the structure in game?

Put the .nbt in your world's generated/minecraft/structures folder or a datapack, then load it with a structure block set to Load.

What if the model exceeds 48 blocks per axis?

Lower the build size, or choose the chunked NBT export, which splits the build into multiple .nbt files you can place next to each other.

Do both ASCII and binary .stl files work?

Yes. Both variants are parsed; binary files are smaller and load faster for dense meshes.

Convert .stl to .nbt

Turn a CAD or printable model into a vanilla Minecraft structure. Bloxelizer voxelizes your .stl in the browser and exports a structure-block .nbt that works on an unmodded client.

Free & unlimited

Runs in your browser

3D & layer previews

Drop a Minecraft schematic

orBrowse

We'll detect the format, let you view your build layer by layer in 2D / 3D, and let you export it to any format.

.schem

.litematic

.bp

.mcstructure

.nbt

.schematic

.mcstructurezip

.mcworld

.zip(Java world)

.prefab.json

.json

.glb

.gltf

.obj

.mtl

.stl

.bbmodel

.geo.json

.png

.jpg

.jpeg

.webp

Or paste a URL

The .stl and .nbt formats

.stl is the stereolithography format of CAD tools and 3D printing: a raw triangle soup with no materials, textures, or colour in either its ASCII or binary form. A structure-block .nbt is Minecraft Java Edition's native format — a block palette, positioned blocks, and a data version — read in-game by a structure block that caps at 48 blocks per axis. The conversion voxelizes the triangles into a block grid, and because the source carries no colour, the palette you pick decides how the structure looks.

How to convert .stl to .nbt

Upload your .stl file in the converter below.

Set the build size and choose the block palette in the preview panel, then apply.

Leave .nbt selected as the export format and download the structure.

When to use this conversion

Good for dropping a CAD shape into a datapack, a custom world generation feature, or an adventure map, where a vanilla .nbt is the only format the game will read.

Compatibility notes

Structure blocks read at most 48 blocks per axis; use the chunked NBT export for anything bigger and it splits into several origin-named files in a zip. Since .stl stores no colour, the block palette you select is the only thing determining the structure's appearance.