Man compares his prosthetic hand to a 3D-printed one
Cool project, but the $42,000 prosthetic probably has only $50 in materials as well, the expensive part is the engineering, fitting, and assembly.  Not really a fair comparison.Models like this are quite exciting - assistive devices and prosthetics are incredibly expensive due to low volume and customisation requirements.  This is preventing innovation and production of new devices and technologies.They are also (rightly) highly regulated.  A next step is trying to figure out how to maintain quality and safety in these kinds of DIY projects.