3D printable models may be produced with computer aided design i.e. CAD package, using a 3D scanner, or via a plain digital camera and photogrammetric software. 3D models made with CAD result in fewer errors and can be modified prior to printing, permit verification in design of object prior it is printed. The manual modelling procedures of making geometric data for 3D computer graphics is like plastic arts like sculpting. 3D scanning is a procedure of gathering digital data on the shape and appearance of actual object, making a digital model on the basis of it. If you are looking for 3D Printing UK or Rapid Prototyping, then you should visit http://www.3dprint.co.uk/.
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