On 30 March, the Armament Research Services published a report that examines the range of emergent technologies which are influencing the craft-production of small arms by individuals, and the effects these are having on the types of weapons that can be produced, and the viability of those outputs. It seems that 3D-printed firearms have come a long way since 2013, and weapons are steadily improving. There is a mistaken belief that such designs are limited to only a few models.
http://armamentresearch.com/wp-content/uploads/2020/03/ARES-Research-Report-8-Desktop-Firearms.pdf
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