Here is another molecule necklace design. Serotonin is known for well-being and happiness!
This pendant was designed to hold 4mm SS16 rhinestones, but I also designed a version with just circles in case you don't want or don't have rhinestones.
Though the design is pretty basic, I tried to give it something a little extra by making the connections oval/cylinders rather than just rectangles.
Printing it is pretty straightforward. The only thing is I suggest 100% infill to get it as sturdy as possible since it is so dainty.
Design and full assembly instructions can be found on Instructables: https://www.instructables.com/id/Rhinestone-and-3D-Print-Molecule-Necklaces/
I am also selling the rhinestone version of this pendant on Etsy: https://www.etsy.com/listing/662096571/rhinestone-and-3d-print-serotonin