Licences

This page exists because a hosted web app hands its JavaScript to every visitor, and handing somebody a program is distributing it. Everything listed here runs on your own machine, in your own browser. None of it is a service, and none of it sends your picture anywhere.

What this app is built from

The list below is the whole of it — the four things that reach your browser, and nothing else. All three dependencies are permissively licensed; there is no GPL- or AGPL-licensed code in the bundle.

manifold-3d is the solid-geometry kernel, compiled to WebAssembly. It is what extrudes each colour band into a solid and cuts the pencil bore. fflate is the zip implementation; a 3MF file is a zip with XML inside it, so it writes the file you download. three.js draws the small 3D preview, and only that — it never touches the geometry it is shown or the file you download. Everything else — decoding your picture, reducing the palette, tracing the outlines — is this app's own code and the browser's own image decoder.

manifold-3d — Apache License 2.0

Licensed under the Apache License, Version 2.0. You may obtain a copy of the License at /licences/manifold-3d-Apache-2.0.txt, or at apache.org/licenses/LICENSE-2.0.

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

The project ships no NOTICE file, so the licence text above is the whole obligation.

fflate — MIT License

MIT License

Copyright (c) 2026 Arjun Barrett

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

three.js — MIT License

The MIT License

Copyright © 2010-2026 three.js authors

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

Declared but not shipped

For completeness, because a dependency tree and a bundle are not the same thing. manifold-3d declares @gltf-transform/* and sharp as dependencies, which serve its Node-side command-line tooling. Neither is reachable from this app's browser entry point and neither appears in the built bundle. That matters for one of them in particular: sharp's platform binaries (@img/sharp-libvips-*) are LGPL-3.0-or-later. They are native binaries for Node, are never served to a browser, and are not part of what this page describes as distributed.

Verifying this page

This list is maintained by hand and can drift from the dependency tree. Two commands in a clean clone re-establish it: npm ls --omit=dev --all for what is declared, and npm run build && grep -c gltf dist/assets/*.js for what is actually bundled — the second should print 0 for every chunk.