VSEPR Molecule Kit – Real Bond Angles (Water 104.5°, Ammonia 107°)
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Snap-together molecule kit with real VSEPR bond angles (water 104.5°, ammonia 107°). 8 geometries, no supports.
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Model information
- Source
- Printables
- Category
- Chemistry & Biology
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
A snap-together molecular model kit for chemistry class, with the real VSEPR bond angles instead of approximating everything with 109.5°.
Included atom geometries (central atoms: 22–24 mm)
File | Geometry | Angle | Example |
|---|---|---|---|
C_linear_2bonds | Linear | 180° | CO₂, BeH₂ |
C_trigonal_planar_120deg | Trigonal planar | 120° | BF₃ |
C_tetrahedral_109deg | Tetrahedral | 109.5° | CH₄ |
N_pyramidal_107deg_ammonia | Trigonal pyramidal | 107° | NH₃ |
O_bent_104deg_water | Bent | 104.5° | H₂O |
P_trigonal_bipyramidal | Trigonal bipyramidal | 90° / 120° | PCl₅ |
S_octahedral_90deg | Octahedral | 90° | SF₆ |
H_hydrogen_1bond | Terminal atom (H, F, Cl…) | — | — |
Two bond lengths are included (16 mm and 24 mm pegs).
Printable without supports. Each atom is rotated so that no bond points down into the bed, and has a small flat base. Holes have a chamfered entry.
Print settings
PLA, 0.16 mm layers, 3 walls, 15 % infill. No supports.
Print pegs standing up, spaced apart.
Fit: holes are 5.3 mm and pegs 5.0 mm. If pegs are too tight, scale them to 98 %; if too loose, to 102 %.
Colour suggestion (CPK): C black, H white, O red, N blue, halogens green, P orange, S yellow.
molecule_kit_plate.3mf holds a full starter set on one 256 mm plate: 8 central atoms, 16 terminal atoms, 16 long and 8 short pegs.
Designed parametrically in code with AI assistance, checked for watertight geometry and overhangs, and rendered in Blender. The images are renders.