Complex sentence: The premise of 3D printing was roughly implemented by way of modeling the characters in'and then utilizing' to upload the data to Randnet's online printing service, and then cutting, folding, and pasting the resulting colored paper into a physical 3D figure.
Split into simpler sentences: The premise of 3D printing was roughly implemented by way of modeling the characters in'and utilizing' to upload the model data to Randnet's online printing service. The user then cuts, folds, and adheres the resulting colored paper into a physical 3D figure.