The 62350® Indigo Point Group set can build a model of staggered ethane to show a D3d point group. Other compounds with D3d point group symmetry are: 1,3,5-triazine; 2,4-hexadiyne; 2-butyne; bicyclo[1.1.1]pentane; cyclopropane; prismane.
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.