Most of what I see in my house is made from a fair number of parts, each of which took some rather complex tooling to manufacture. Even the simple-looking stuff

Most of what I see in my house is made from a fair number of parts, each of which took some rather complex tooling to manufacture. Even the simple-looking stuff took a lot to produce. Those plain sandals on the floor? They needed three different looms for the three kinds of fabric, plus whatever kind of molder is used for the rubber sole. And sewing machines in various configurations. That tea kettle? It needs to be made of parts that can withstand extreme heat. It's got a copper bottom and steel sides, plus a handle that must be made of some kind of heat-resistant plastic. That briefcase? Fake leather (however that's made), steel hardware of various sorts, and zippers. All hooked together with riveters, sewing machines, and other tools. Most items you own are the result of a large number of industrial processes. There's an amazingly intricate web of raw materials producers and manufacturers behind nearly everything. Conceivably, some or many of these processes could be replaced with printing, but that's not even on the horizon at this point. To be more specific, I see big challenges in printing materials with the right properties: flexibility, tensile strength, etc.. There's a reason we use so many different materials in today's products. And then there are the challenges of printing electrical devices. Many of these involve quite a few materials, such as copper, silver, gold, tungsten, and on and on. Many also involve a high degree of miniaturization (I'm thinking of chips here).