Figure 4. CAD-Design (left), prototypes of self-developed models of “atoms” and “binding electron pairs” (right)

From

3D Printing in Chemistry Teaching: From a Submicroscopic Molecule to Macroscopic Functions - Development of a Molecular Model Set and Experimental Analysis of the Filaments

Michael Scheid, Kristina Hock, Stefan Schwarzer

World Journal of Chemical Education. 2019, 7(2), 72-83 doi:10.12691/wjce-7-2-6