This is a model that was designed to illustrate various molecular geometries as well as chirality. Print in as many colors as you need to demonstrate chirality, as shown in the example picture, or print in whatever colors are suited for your use.

Tolerances are very TIGHT. Consider a lubricant for the first time screwing in to help. No need for supports on the vertical threads, they print fine without them. The downward facing threads of the trigonal planar and tetrahedral do require supports. Tree supports worked just fine for me.