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It has been more than three decades since stereolithography first appeared in various forms of additive manufacturing and 3D printing. Today, a number of contemporary production methods make extensive use of these technology. The greatest segment of the 3D printing market at the moment is the creation of various polymer components, notably complex structures that cannot be produced using traditional manufacturing processes. Conventional printer head systems have also been adapted to selectively print various types of speciated human cells and special chemicals in an effort to produce human organs, starting with skin and various tissue patches. These initiatives and the use of powder layers that are selectively melted into complex forms (like foams and other open-cellular structures) under the control of laser and electron beams guided by CAD software are discussed along with the fabrication of metal and alloy for various implant and bone replacement components. We'll quickly go through efforts to eventually vascularize and infiltrate bone into these implants in order to create a "living implant". Novel printer heads for direct metal droplet deposition in different 3D printing techniques are briefly described because these concepts will eventually allow the production of very large and complex objects, such as automobile and aerospace structures and components.

Other layer printing methods evolved from lithography (about 1797), continued with multicolor (layer) printing using chromolithography (still in use today), and finished with photolithography (IC manufacture).The term "stereolithography" was first used in the 1980s by Charles Hull to describe a method for fabricating a variety of solid structures by layer-by-layer printing thin liquid photopolymer resins that were then cured by intense ultraviolet beams (usually a UV laser).A stereolithography system, also known as rapid prototyping (RP) or solid freeform fabrication, is shown in a simple schematic.

In a system where the build piston lowers the build table to achieve the appropriate layer thickness above the building product, a focused laser beam employs mirror scanning to cross a layer (x-y) while using a CAD or stereolithography (STL) file to photo-cure specific layer parts. The instructions in this file are for making a 3D product, which is typically more difficult to produce than any other product or method.

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