I'm just not sure of the strength of printed parts. One of the problems is that all 3D printers use a thermal process which means using thermoplastic resins. Parts for guns are generally made with thermosetting resins. I'm not ready to buy the hype.
Remember plastic guns that would go through the X-ray machines. There's a lot of fud out there, much of which is meant to create hysteria. Don't drink the Kool-aid.
Seems suited fine for magazines, I'm still not sold on using it for a lower.
Video said they used ABS for the magazine.
Needs better impact resistance as the video shows it breaks.
They said they have one that has survived 90 rounds, but how many more? https://en.wikipedia.org/wiki/Acrylonitrile_butadiene_styrene
People are going in the wrong direction. you dont want to use plastics for printing. Use Waxes that can then be made up for molds and pout the aluminim yourself. A Bit of machining and you have a cast lower, upper, etc.