The tinier printer does gain portability from the size shrink (it has only has room for a 5.5-inch cube) and the ability to be powered by a battery thanks to its low power-draw.
The government may simply insist that 3D printer manufacturers install software that prevents printing of a hollow cylinder of a certain size, a firing pin, or a certain type of spring.
E-textiles have been around for centuries (think metallic thread) but now that computers have become the size of a pack of gum, affordable and easily programmable, and a new 3D Printer comes on the market daily, fashion tech is starting to catch on and more and more widespread.