Use the 62350 Indigo Teacher's Point Group set to make a model of eclipsed ethane to illustrate a D3h point group. C2H6 has a C3 rotation axis and 3 perpendicular C2 axes which places it in the D3h point group. Another example shown in 2 other model styles is Orbit D3h PCl5 or Unit D3h eclipsed ethane which also belong to the D3h point group.
You can also build the H2O2 C2 point proup chemical structure with the 62053 university organic stereochemistry molecular model set & the 62009 college molecular model kit for organic chemistry.