KAVITHA MOHAN S3ECE ROLL NO:41 3D PRINTING KAVITHA MOHAN S3ECE ROLL NO:41

HISTORY 3D printing / Additive manufacturing Process of making three dimensional solid objects from a digital file. An object is created by laying down successive layers of material until the entire object is created.

GENERAL PRINCIPLES MODELING: PRINTING with a computer aided design (CAD) package/or via a 3D scanner /via a plain digital camera and photogrammetry software PRINTING To perform a print, the machine reads the design and lays down successive layers of liquid, powder, or sheet material to build the model from a series of cross sections. These layers, which correspond to the virtual cross sections from the CAD model, are joined together or automatically fused to create the final shape.

FINISHING Though the printer-produced resolution is sufficient for many applications, printing a slightly oversized version of the desired object in standard resolution, and then removing material with a higher-resolution subtractive process can achieve a higher-resolution.

Methods of 3d Printing Selective laser sintering (SLS) Laminated object manufacturing or LOM Stereolithography (SLA) Polyjet or Jetted Photopolymer (J-P) Fused deposition modeling/fused filament fabrication (FDM/FFF) Cladding or Laser Powder Forming or Laser Fusing Laminated object manufacturing or LOM

SLS :uses a high powered laser to melt powder together for musical instruments SLA: A layer of fluid resin is hardened by UV or laser no need for post-finishing. PJ: extrudes a photopolymer which hardens with UV light. can create rubber-like objects. for creating one-piece string instruments FDM: most seen 3d printing method a plastic wire is molten and laid down in layers. Inherently unsolid material, always has air-spaces and fuse lines

LPF: Instead of feeding the printing head a solid core of material, a powder is fed. A method for making very detailed and small parts LOM: Sheets of raw material are laid on each other, after which it will be cut out by laser or knife.

Biomedical Engineering: APPLICATIONS Biomedical Engineering: Creating limbs and other body parts out of metal or other materials to replace lost or damaged limbs. More accurate Faster

Construction and Architecture 3D printing concept to create entire buildings

Product Prototyping Allows designers to create and the next day see and touch their design Earlier the process was tedious without 3D printing