Oven knobs, fine. But there are so many things that can't be machine printed; they require the assembly of components made of very different materials. Take "s

Oven knobs, fine. But there are so many things that can't be machine printed; they require the assembly of components made of very different materials. Take "sporting goods" mentioned in the article. Tennis racquet: supposing you could print a frame that was strong enough (dubious) with an acceptable grip feel (very dubious), you can't print the strings. They need to be assembled into the frame. Baseball, baseball mitt, basketball, etc. Somebody here mentioned you can't print headphones, anything electromechanical. I'll add, anything with a circuit board in it, anything with an LCD or OLED screen on it; anything with a motor in it; anything with a heating element (coffee maker, hot pad). Anything with springs or hinged or rotating parts (many toys).