Oversized kit for demonstrating molecular structures.

**Options**

_Atoms_

- 1-Bond
- 2-Bond
- 2-Bond Alternate (120 degree offset ports)
- 3-Bond
- 4-Bond
- Hydrogen - A smaller version of the 1-bond atom.

_Bonds_

Bonds come in multiple sizes and two style. Default stems allow atoms to rotate freely. Locked stems prevent atoms from rotating.

- Long Stem
- Medium Stem
- Short Stem
- Mini Stem
- Flex Stem Long
- Flex Stem Short

_Caps_

Caps are used to secure bonds to an atom. Bonds are free to spin after assembly.

- Default - Simplest option
- Split - Tighter grip on bonds, but comes in 2 parts. This is the recommended cap when using flex stems.
- Alt - Use with you own custom bond materials: bungee, rope, etc. 

**Printing**

- All parts can be printed in PLA or PETG, but avoid brittle PLA blends.
- Flex stems are best if printed in PETG or a rigid TPU (95A/98A). If printed in PLA, the flex stems will eventually deform.
- All parts can be printed without supports. However, some sections of the interior threads have significant overhangs that require well-tuned cooling.
- Test print a 4-bond atom, a  default cap, and a short stem to check for proper fitting. If the fitting is too loose, you can get tighter results by adding a very slight fuzzy skin to the relevant surfaces.

**Assembly**

- Slide stem into cap.
- Screw cap into an atom port.
- Repeat to assemble a full molecule.



**Can I sell copies of this?**

Yes! This project was shared under the [Creative Commons - Public Domain](https://creativecommons.org/publicdomain/zero/1.0/) license.

This license grants you permission to download, distribute, alter, print, and sell copies of this design.

This license applies only to the model files (STL, 3MF, STEP, F3D) included in this project. It does not apply to photos, videos, my logo, or other supplemental graphics attached to or displayed with this project.

_Attribution Text_

This license does not require attribution. But if you choose attribute my work, feel free to use the following text.

"Braille Sheet" (https://3dprinty.xyz/project/147) is designed by 3D Printy (https://3dprinty.xyz) and shared under a Creative Commons Public Domain (CC 0 1.0) license (https://creativecommons.org/publicdomain/zero/1.0/). 

Giant Molecular Model Kit

Demo - All Files.stl

Stem Mini.stl

Stom Long Locked.stl

Stem Medium Locked.stl

Stem Short Locked.stl

Stem Mini Locked.stl

Hydrogen Stem Locked.stl

Hydrogen Stem.stl

Hydrogen Cap.stl

Hydrogen Cap Split B.stl

Hydrogen Cap Split A.stl

Hydrogen.stl

This collection of atoms uses swivel snaps to connect, forming twistable organic molecules that are fun to play with and can be used as a learning tool to demonstrate the shape and movement of organic molecular structures. 

See here for assembly and construction video: https://youtu.be/GdgFAmtWh04 

The focus of this set is on the four main organic elements (carbon, nitrogen, oxygen and hydrogen), but with a bit of imagination they can be used to represent other atoms as well.

For the sake of simplicity, this set treats double and single covalent bonds the same. This means that a carbon atom with one double and two single bonds uses the same file as a nitrogen with three single bonds because both atoms are bonded with three others and have a similar trigonal pyramidal shape. You may choose to print them in different colours though.

In order for the atoms to fit together properly, bond angles and relative sizes are approximations.

In this set, carbon and nitrogen are the same size: “large”. Oxygen is “medium”. Hydrogen is “small.” For each atom, you will need to print out one of each for the “male” and “female” sides of the hemisphere, and the appropriate number of “swivel snaps.”
The files are named for their size (small, medium or large), the number of swivel snaps involved (1, 2, 3 or 4), the orientation of the snaps (tetrahedral, trigonal pyramidal, angular or linear),  and the side of hemisphere (male or female).

Here are the files that you will need for each atom:

Carbon (with 4 single bonds): Large 4 Tetrahedral (male and female) and 4 swivel snaps
Carbon (with 1 double, 2 single bonds): Large 3 Trigonal Pyramidal (male and female) and 3 swivel snaps
Nitrogen (with 3 single bonds): Large 3 Trigonal Pyramidal (male and female) and 3 swivel snaps
Nitrogen (with 1 double and 1 single bond): Large 2 Angular (male and female) and 2 swivel snaps
Oxygen (with two single bonds): Medium 2 Linear (male and female) and 2 swivel snaps
Oxygen (with one double bond): Medium 1, no swivel snaps
Hydrogen (with one single bond): Small 1, no swivel snaps

Do not print the "Display Model!"

Be sure to remove all burrs and brims before assembling the pieces. Place the snaps inside the male and female hemispheres and glue them together. CA glue works well.

The tolerance for the snaps is intentionally tight and they will require some force to connect the first few times. After snapping on and off a few times, any imperfections in the interfacing surfaces will be smoothed out and the snaps should remain snug and reliable. If this doesn't work, use a small file or abrasive to smooth out the snap surfaces. (If the snaps are designed to be easy to connect right off the printer, they quickly become loose and non-functional.)


Fidget Molecules

Fidget Molecules - Display only.stl

ATOM

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