3,4-Dihydroxybenzaldehyde — License & Provenance

CAS 139-85-5 · C7H6O3 · MolGod 3D molecular model

3,4-Dihydroxybenzaldehyde (CAS 139-85-5) — MolGod molecule record: properties, safety, literature and sources for this substance.

Identity

Geometry provenance

Preview

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Rendered from this exact STL file, not from a second source. Single material — the STL format carries no colour channel. Colours in the preview are assigned by the renderer from the element palette and are not part of the downloadable geometry.

Engraved variant

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The element symbol is cut into the sphere, not printed on it. That single difference is what this variant is for.

• Print it and you can still read it. The letters are part of the solid, so they survive 3D printing. Pick up the printed model and every atom tells you what it is — no legend, no colour key, no separate sheet. A painted label would vanish the moment the file leaves the screen.
• It cannot lose its labelling. The symbol is geometry, not a texture or a material. Open the file in any viewer, any slicer, any CAD package — on any machine, in any colour scheme — and the letters are still there, because there is nothing to strip away.
• Bond order is visible in the shape itself. Single, double and triple bonds are built as one, two and three cylinders, following the PubChem Kekulé structure, so a double bond looks like a double bond in your hand. An aromatic ring therefore appears as one Kekulé structure (alternating single and double bonds), although in the real molecule its ring bonds are delocalised, intermediate between single and double.
• Teaching and display models that stay correct. Nothing about the identification depends on the software, the render settings or the filament colour.

Why the preview looks the way it does. A carved letter has no colour of its own — on a pale atom it would disappear into the highlight. The preview is rendered from the mesh itself with ray-traced cavity shading, so recesses darken because they are recessed, not because we painted them. What you see is the geometry you will receive. The element colours follow the same palette as the interactive viewer on this site, so the model and the viewer never disagree about what an atom is.

Element symbols are recessed into the atom spheres. Mesh: 223,982 triangles versus 7,040.

Download engraved variant: 3,4-Dihydroxybenzaldehyde-3D-molecular-model-engraved-CAS-139-85-5.stl (11 MB)
SHA-256 a495616a69be25d88a61473ab9bb3554c1e4078f62dd0011d782360756643e48
Validation: mesh validity check PASS before publication (2026-10-14); overlay check PASS (7 of 7 common criteria, 3 of 3 fused-solid criteria correctly inverted), checked 2026-11-08T01:38:27Z
Recommended print scale: FDM (0.4 mm nozzle, 0.2 mm layer) at least 7.2 mm per Å (model about 42 mm across); resin printer (50 µm) at least 1.7 mm per Å (about 10 mm). Below this scale the engraved symbols become too fine to print. The printer limits are typical values assumed by MolGod, not a test of your printer.

Artefact

License

Licence grant. MolGod Scientific, the creator and copyright holder of the STL mesh of MolGod entity MG_877-941-214-93, variant normal (SHA-256 b1da29bc1471bbab400bd54a0482d91529396ea08e80517d88923f50e4510f1f), hereby releases it under the CC BY-SA 4.0 International licence. The release covers the MolGod-created mesh only, not third-party source material (see Scope above).

The license above is the legal instrument and is granted by its official Creative Commons deed. This page is the MolGod provenance record for the artefact; it documents the source and the pipeline, and does not impose any condition beyond those of the license itself.