I remember seeing a comment about the strength of the brackets that Motominded make for their light kits, which are 3D printed. I'm not sure which plastic they are using. I know they aren't 3D printing them in metal. That equipment costs $100K+. I have a friend who does 3D printing, among other things for a living, and he explained the differences in plastics available for printing, and how you can "orient" the grain of the part for strength. Neat stuff.