It will pay for itself with 30 round magazines printed up.
And soon. only the weakest of plastics will be legally available for use in it. Look for the raw materials to be legislated behind the scenes and pressure put on the manufacturers.
The other thing to consider is that for much less the tools can be bought to make mags from actual metal and it is not hard to do. The problem is that it’s more work than a mouse click.
Don’t get me wrong. I think this 3DP thing is great! but it’s not going to be as pain free as many think.