So, youâ ve got a 3D printer and want to make a little bit of that investment back? Me too, and before I started selling 3D printed items commercially, there were several steps I took to prepare.

At what point does it make sense to 3D print a part compared to opting for injection molding? The short answer is “it depends.” The medium-sized answer is, “it depends on some back-of-the-envelope ...