well with me it's both a hobby and part of my business.

And in what universe is it comparable with wrenching and sawing ?
I think of a thing, I design the thing and my 3d printer makes the thing.

If I use a saw - I need wood, nails, glue screws and plans - which I am bloody awful at drawing.
If I have a wrench - I need lots and lots of other things to go with it.

I agree that a 3d printer is a tool. However it is NOT comparable to a saw or a wrench :-)
It's equivalent is a fully manned and tooled up production line at a plastics factory.