The 32 Crystallographic Point Groups ("spheres / rings" set)

Models of all 32 Crystal Classes (= crystallographic point groups) for teaching or practice. 

For single color printing simply do not use the accent files. The accents come in a protruding or flush variant (see images), just use what you like better.

Here are some simple display stands for these models.

The spheres are 10 cm in diameter, so probably you'll want to scale them down. For FDM printing I would advise using the split models I provide, and glue the halves together (use rubber bands, the parts have a little key piece to help with alignment&orientation). The shown prints were done this way (50% scale). At 50%, using 10% infill, 2 bottom layers, automatic ("adaptive") variable layer height, and otherwise 0.15mm defaults, each of the spheres takes ~20g of filament. This makes them ideal to use up filament leftovers.
I found it doesn't make much difference visually whether you use 0.15 mm or adaptive layer height. I have only printed the cubic models so far to make sure they work. 40% scale or smaller does not look good with a 0.4 mm nozzle.

I consider these models very difficult due to the intrinsic high symmetry of rings and the spheres they are projected on.
 

Check out my other symmetry models:

Minimal set
Didactic set
(Pseudo-)Minerals set
Simple Set
Molecules set
Real Life Set
Spheres (Pac-Man)
Teddys