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Atomizer is a toolpath generator designed for Fused Filament Fabrication (FFF) 3D printing. Unlike traditional methods that slice the model layer by layer, Atomizer "packs volume with atoms," enabling toolpaths that transcend planar layers.

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# Atomizer: Beyond Non-Planar Slicing for Fused Filament Fabrication

![Representative toolpath visualization](https://raw.githubusercontent.com/xavierchermain/atomizer/main/data/image/doc/representative_image.png)

This repository contains the implementation of **Atomizer**, a novel toolpath generation algorithm for fused filament fabrication (FFF) 3D printing. Atomizer introduces the concept of *atoms* as a replacement for traditional slices. This method enables collision-free toolpaths that tightly conform to complex geometries and offer new fabrication capabilities.

- [Project page](https://xavierchermain.github.io/publications/atomizer)
- [Article (preprint)](https://drive.google.com/file/d/1P4MiYd7Qz1rJdqrq3-CEuzC4vQ2PIMeO/view?usp=sharing)
- [Supplemental Video](https://youtu.be/d9SBcfkywqA)

*[Xavier Chermain](https://xavierchermain.github.io), [Giovanni Cocco](https://github.com/iota97), [Cédric Zanni](https://members.loria.fr/CZanni/), Eric Garner, [Pierre-Alexandre Hugron](https://www.linkedin.com/in/pierre-alexandre-hugron-b7b22552), and [Sylvain Lefebvre](https://www.antexel.com/sylefeb/research)*

[Université de Lorraine](https://www.univ-lorraine.fr/en/univ-lorraine/), [CNRS](https://www.cnrs.fr/en), [Inria](https://www.inria.fr/en), [Loria](https://www.loria.fr/en/)

[Computer Graphics Forum](https://doi.org/10.1111/cgf.70189) ([Proceedings of the Symposium on Geometry Processing](https://sgp2025.my.canva.site/program-page-sgp)), 2025

**SGP Honorable Mention**

Replicability Stamp: [http://www.replicabilitystamp.org#https-github-com-xavierchermain-atomizer](http://www.replicabilitystamp.org#https-github-com-xavierchermain-atomizer)

[![](https://www.replicabilitystamp.org/logo/Reproducibility-small.png)](http://www.replicabilitystamp.org#https-github-com-xavierchermain-atomizer)

## Key Features

* Toolpath generation using frames (i.e., atoms) instead of slices
* Control of the deposition direction and tool orientation
* Collision-free toolpath ordering
* Support for anisotropic appearance on curved surfaces

## Replicating One Result (for the Impatient)

This set of PowerShell commands reproduces the colored mesh of Fig. 17 (top left) from the article. You’ll need Windows 10 or newer and Blender to visualize it.

Open **PowerShell as Administrator**, then run:
```ps1
winget source update
.\install_git_blender_miniconda.ps1
```
Close **and reopen** PowerShell. Then run:
```ps1
git clone https://github.com/xavierchermain/atomizer
cd atomizer
conda create --name atomizer python=3.10
conda activate atomizer
pip install -e .
python tools/atomize.py data/param/tubes.json
python tools/toolpath_to_ply.py data/toolpath/tubes_smoothed.npz data/mesh/tubes.ply
blender --python see_toolpath_with_blender.py -- "data/mesh/tubes.ply"
```

**Notes**

* The script `install_git_blender_miniconda.ps1` sets up Git, Blender, and Miniconda if needed. You have to download the script [install_git_blender_miniconda.ps1](./install_git_blender_miniconda.ps1).
* `pip install -e .` installs the local library in editable mode inside the `atomizer` conda env
* If `blender` isn’t on your `PATH`, use the full path to `blender.exe`.
* If something goes wrong, please read the following.

## Installation

The code compiles, runs, and is maintained on Windows 10 or newer. It has also been tested on Linux and macOS, but we do not provide installation guidance for those platforms. The following installation instructions target Windows 10 or newer.

### Dependencies

To install the dependencies (Git, Blender, and Miniconda), we provide a script that automatically downloads and installs all of them:
```ps1
.\install_git_blender_miniconda.ps1
```
The script checks whether the softwares are already installed; if not, it installs them and adds them to the `PATH`. Alternatively, you can install them manually by following the instructions on the respective software websites.

- **Blender** must be installed and added to your executable path. It is used to remesh the model (see [`tools/process_for_atomizer.py`](tools/process_for_atomizer.py)) for the atomizer. We tested with Blender 4.4 and 4.5.
- **Git and Miniconda** are optional dependencies if you are already comfortable with code cloning, Python environments, and modules.

### Clone the Repository

```
git clone https://github.com/xavierchermain/atomizer
```

### Install Python and Module Dependencies

This implementation is written in Python 3.10. Supported versions are Python >= 3.7 and < 3.11, as required by the [Taichi](https://www.taichi-lang.org/) module dependency. The implementation also relies on the local library [`src/atom`](src/atom). Please refer to [`pyproject.toml`](pyproject.toml) for the complete list of Python module dependencies.

#### Conda

We recommend using [Miniconda](https://www.anaconda.com/docs/getting-started/miniconda/install) to install a specific version of Python, the dependencies, and the local library [`src/atom`](src/atom):

```
conda create --name atomizer python=3.10
conda activate atomizer
pip install -e .
```

## Usage

### Atomize

```
python tools/atomize.py data/param/<json_filename>.json
```

The parameters in the JSON file are:

* `solid_name`: the filename of the STL representing the 3D solid, without the extension. The STL file must be located in the `data/mesh/` folder and have the `.stl` extension.
* `deposition_width`: the deposition width in millimeters. The layer height is half the deposition width in our implementation.
* `max_slope`: the maximum tilting angle of the tool, in degrees.
* `top_lines` and `bottom_lines` (optional): paths to single-channel, 8-bit-per-pixel PNG files representing the target tangent directions for the top and bottom surfaces, respectively. The mapping is $\[0, 255] \leftarrow \[−\pi/2, \pi/2]\$. The orientation defines a 2D line in the xy-plane. The 2D line field is defined on the upper face of the solid’s bounding box and is planarly projected onto the top and bottom surfaces along the z-axis.
* `ortho_to_wall` (optional): if true, forces the tool orientation to be parallel to the boundary. By default, this is false, as enabling this feature causes many tool orientation changes that are detrimental to surface quality.
* `infill` (optional): if true, a gyroid pattern infills the solid.

The inputs and outputs are:

* **STL input:** `data/mesh/<json_filename>.stl`
* **Toolpath output:** `data/toolpath/<json_filename>.npz`
* **Log file:** `data/log/<json_filename>.log`

Refer to the log file to see all the individual computation and visualization commands.

Add the `--warmup` option to exclude the compilation time from the computation time reported in the log file. **Caution:** this causes each step of the pipeline to run twice, as Taichi uses just-in-time compilation.

#### Example

```
python tools/atomize.py data/param/tubes.json
```

### Visualize

After using the atomizer, you can visualize the generated `<toolpath>` with:

```
python tools/visualize_toolpath.py data/toolpath/<toolpath>.npz
```
Use the `WASD` keys and the right mouse button to move the camera. Press `H` to hide the travel paths.

Check the log file generated by the atomizer tool to see all individual visualization commands.

#### Example

```
python tools/visualize_toolpath.py data/toolpath/tubes_smoothed.npz
```

#### Export Toolpath Mesh

![Toolpath mesh](https://raw.githubusercontent.com/xavierchermain/atomizer/main/data/image/doc/toolpath_mesh.png)

```
python tools/toolpath_to_ply.py data/toolpath/<toolpath>.npz data/mesh/<toolpath>.ply
```

The generated mesh `<toolpath>.ply` can be visualized in Blender.
```
blender --python see_toolpath_with_blender.py -- "data/mesh/<toolpath>.ply"
```

The script displays the toolpath relative length using the Turbo colormap.

To do it manually, you need to add a material to the mesh. Then, in the **Material** tab, do the following:

1. Select **Base Color**.
2. Choose **Color Attribute**.

To visualize the vertex color attribute:

1. Select **Shading** (shortcut **z**).
2. Choose **Material Preview** (shortcut **2**).

##### Example

```
python tools/toolpath_to_ply.py data/toolpath/tubes_smoothed.npz data/mesh/tubes.ply
blender --python see_toolpath_with_blender.py -- "data/mesh/tubes.ply"
```

### Commands Manuals

Tool manuals are accessible by typing `--help`, e.g.,
```
python tools/atomize.py --help
```

## Repository Structure

```
atomizer/
├── tools/                             # The main tools
│    │── atomize.py                    # Main pipeline entry point
│    │── bpn_to_sdf.py                 # SDF generation and voxelization
│    │── compute_tool_orientations.py  # Tool orientation field optimization
│    │── compute_tangents.py           # Deposition tangent field optimization
│    │── align_atoms.py                # Tricosine field optimization
│    │── extract_explicit_atoms.py     # Atom extraction
│    │── order_atoms.py                # Atom ordering
│    │── visualize_bpn_sdf.py          # Visualize SDF
│    │── visualize_bpn_df.py           # Visualize tool orientation field
│    │── visualize_bases.py            # Visualize deposition tangent field
│    │── visualize_implicit_atoms.py   # Visualize tricosine field
│    │── visualize_explicit_atoms.py   # Visualize explicit atoms
│    │── visualize_toolpath.py         # Visualize generated toolpath
│    └── ...                           # Other tools
│── data/                              # Input and output data
│    │── mesh/                         # Input STLs
│    │── param/                        # Input parameter JSON files
│    │── toolpath/                     # Output toolpaths
│    └── ...                           # Other data
├── src/atom/                          # Local library with core functionalities
├── experiment/                        # For experimenting with core functionalities
├── generate_results.ps1               # Script to generate toolpaths
└── README.md
```

## 3D Printer

Atomizer was tested on a custom 5-axis printer with independently controlled Z-axis screws. The customization is intended for experts and is described in another article : [https://xavierchermain.github.io/publications/threez](https://xavierchermain.github.io/publications/threez). For now, the code generates the sequence of positions, each associated with a tool orientation and a travel type (deposition or no deposition). The generated toolpaths are available in [`data/toolpath`](data/toolpath). To print, you must use the inverse kinematics model of your machine. The G-code generated for our machine is located in [`data/gcode`](data/gcode). Note that files ending with `_craftware.gcode` can be opened with Craftware Legacy to inspect the toolpath (the travel moves represent the tool orientations).

## Citation

If you use this code in your research, please cite:

```
@article{Chermain2025Atomizer,
author = {Chermain, Xavier and Cocco, Giovanni and Zanni, Cédric and Garner, Eric and Hugron, Pierre-Alexandre and Lefebvre, Sylvain},
title = {{Atomizer: Beyond Non-Planar Slicing for Fused Filament Fabrication}},
journal = {Computer Graphics Forum (Proceedings of the Symposium on Geometry Processing)},
year = {2025},
doi = {10.1111/cgf.70189},
volume = {44},
number = {5},
}
```

## License

The source code is under the BSD 3-Clause "New" or "Rivised" license. See
[LICENSE](LICENSE) for more details.

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