Naphthalene, C10H8, is two 6-membered rings fused along one shared edge, and both rings are aromatic. That gives 18 atoms in total, 10 carbons and 8 hydrogens, held together by 19 bonds: 8 single and 11 aromatic. Not a single carbon here is sp3.
Every sphere on this ball-and-stick print has its element symbol engraved into the surface, so carbon and hydrogen are easy to tell apart at a glance, no paint needed.
Printing notes: at its native size the STL comes out tiny, so scale it up in your slicer. PLA on any FDM machine is fine. Put light supports under the bonds and the lower spheres, and pick a fine layer height so the engraved letters stay crisp.
Its closest relatives in the same collection are anthracene and 2-methoxynaphthalene. Atom positions come from a computed 3D conformer. Shared under CC BY-SA 4.0, made by MolGod.
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Naphthalene Molecule 3D Model with Engraved Atoms (CAS 91-20-3)
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