I’m sure it would be alot cheaper to just buy a welder and make your own from a little bit of sheet metal and a spring. There’s nothing sensational about a 3D printed magazine. I’d be more impressed when they can start layering metal with extreme precision and can make small metal parts. That’ll be much more useful.
I’m sure that’s coming. We won’t recognize industry 10 years from now.
http://www.gpiprototype.com/?gclid=CN3FwKfu77QCFQ-f4AodGFAA8w
Direct Metal Laser Sintering - I don’t know if the result is suitable for use in a magazine, what little I know about sintered metal is that it might be too brittle, but these things are progressing rapidly.