Didn't there used to be a problem with 3D printed parts going brittle
and breaking when subjected to UV light, like sunlight or fluorescent
lamp light?
What the world really wants is a 3D printer to print 3D integrated
circuits, including cooling ducts -either for cooling fluid or
alternatively for (heat) conductive material like copper, or both. Can
silicon and other constituents of ICs be accurately sprayed under
computer control?