Actually the furor around this has tempted me to design a 3D printed air pistol with a fillable compressed air chamber similar to how many modern metal airguns work.
It would fire a single sharp, finned plastic (or wood, or carbon fiber, or ceramic, or...?) projectile.
I'm quite confident that such a gun could be lethal against an unarmored person. It also would NOT be covered by the "Undetectable Firearms Act", and would certainly serve the purpose of the "Liberator" pistol of WW II - getting a "real" gun from a bad guy.
The real beauty of it would be that it would require nothing beyond the printer, filament, and an air compressor or pump. I wonder how available 3D printers are in places like Iran and Venezuela...
Interesting times we live in...
Whoops, I’d meant to address #73 to ‘All’...I hope you find it worthwhile.