58. 3D PRINTING-

♤ 3D printing is a method of manufacturing everything from shoes to jewelery, to guns and aerospace parts, using a computer-controlled printer. The fundamental rule of 3D printing is that it’s an additive manufacturing technique, unlike machining, turning, milling, and sawing which are subtractive.

♤ While there are different kinds of 3D printing, all 3D objects are generally built out of layers. A 3D printer starts with the bottom layer, waits for it to dry or solidify, and then works its way up. This layering

process differs depending on the printer and the material it works with — metal, plaster, polymer, resin

— but it also depends on whether it’s an industrial or commercial 3D printer.

♤ 3D printers can be used to create titanium aircraft parts, human bones, complex, nano-scale machines, and more. In the future, it’s fairly safe to assume that we’ll be able to manufacture almost anything with a 3D printer — and everything we can’t make with a printer (clothes, textiles), automated CNC machines, or something like them, will take care of. Ultimately, 3D printers might also be the key to matter replicators, just like in Star Trek. It’s important to note that we already have very accurate tools for creating 3D models of existing objects; we have the ability to scan a cup, and then create an exact copy using a 3D printer.