“3D print for magazines for 1911, M1A, FNFAL, Glock”
I have seen plastic flat Z springs that work in AR magazines. However they wear out and take a “set” much faster than metal ones. I see them as a temporary solution at best.
Perhaps a positive image for a cast? Melt down some brass and pour into a mold? Wish I had the time to play with this.
I am sure that round springs would be much more difficult.