3D printing is much more versatile than LEGO. Take just a random example: a cup holder for in the car. Using 3D printing, it would look and work similar to the ones you can buy in a store. Using LEGO would make it very bulky, aesthetically not so great, and also it would fall apart easily.
I think the original commenter above has simply never used a 3D printer for anything practical.
Which doesn't make sense, either. 3d printers are the ultimate bracket makers. I've used mine numerous times for things like broken sliding light switches or really anything small and made of plastic that breaks.
I think the original commenter above has simply never used a 3D printer for anything practical.