And when someone makes a new affordable tool that opens up making new types of things…. What happens?

Stuff gets made.

Just imagine, chainsaws, lathes, welders and now <gasp> 3D printers. What will they come up with next to give these irresponsible dilettantes a way to create their own objects... what we need here is some proper gatekeeping. Maybe a certificate or two, and some very expensive software that proves that you're a company that is serious.

And while we're at it we should forbid home brew software too.

Sounds like you’re the one who isn’t getting the point.

Personally, I think 3D printed drop in auto sears are pretty awesome.

But it changes the game, and the laws don’t know what to do on that front.

I also bet I own more chainsaws than you do.