There are a variety of very different types of 3D printing technologies, but they all share one core thing in common: they create a three dimensional object creating it layer by successive layer, until the entire object is complete.
Each 3D-printed object begins with a digital Computer Aided Design (CAD) file, created with a 3D modeling program, or which was scanned into a 3D modeling program with a 3D scanner. To get from this digital file into instructions that the 3D printer understands, software then slices the design into hundred or thousands of horizontal layers.
The 3D printer reads this file, and proceeds to create each layer exactly to specification. As the layers are created, they blend together with no hint of the layering visible, resulting in one three dimensional object.
The first commercially available 3D printer (not called a 3D printer back then) used the stereolithography (SLA) method. This was invented in 1986 by Charles Hull, who also at the time founded the company, 3D Systems. A SLA 3D printer works by concentrating a beam of ultraviolet light focused onto the surface of a vat filled with liquid photocurable photopolymer (resin). The UV laser beam draws out the 3D model one thin layer at a time, hardening that “slice” of the eventual 3D model as the light hits the resin. Slice after slice is created, with each one bonded to the other, and next thing you know you have a full, extremely high-resolution three dimensional model lifted out of the vat. Unused resin is reusable for the next job.
3D Printing is a Game Changer
Instantly printing parts and entire products, anywhere in the world, is a game changer. But it doesn’t stop there. 3D printing will affect almost every aspect of industry and our personal lives.
Medicine will forever be changed as new bioprinters actually print human tissue for both pharmaceutical testing and eventually entire organs and bones.
Architecture and construction are changing as well. Now, 3D-printed models of complex architectural drawings are created quickly and inexpensively, rather than the expensive and time-consuming process of handcrafting models out of cardboard. And experimental, massive 3D printers are printing concrete structures, with the goal of someday building entire buildings with a 3D printer.Art is already forever changed. Digital artists are creating magnificent pieces that seem almost impossible to have been made by traditional methods. From sculptures to light fixtures, beautiful objects no longer need to be handcrafted, just designed on a computer.
The Future of 3D Printing
This is a disruptive technology of mammoth proportions, with effects on energy use, waste, customization, product availability, art, medicine, construction, the sciences and of course manufacturing. It will change the world as we know it. Before you know it.for more go to http://www.youtube.com/watch?v=DconsfGsXyA and watch documentaries on 3-D printers.

 







