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Casting and Mold Making...

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  Casting:    Its' a  manufacturing  process in which a liquid material is usually poured into a  mold , which contains a hollow cavity of the desired shape, and then allowed to solidify. The solidified part is also known as a  casting , which is ejected or broken out of the mold to complete the process. Casting materials are usually metals or various  cold setting  materials that  cure  after mixing two or more components together; examples are  epoxy ,  concrete ,  plaster  and  clay . Casting is most often used for making complex shapes that would be otherwise difficult or uneconomical to make by other methods.     3D printing  and injection  molding  aren't really competing technologies so much as they are complementary .  3D  printed prototypes are not typically finished parts. Most FDM machines utilize either ABS or PLA plastic (and others!) which is more often  than  not a different...
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