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The GCODE file generated during slicing is copied to a me mory card that is inserted inthe 3D printer, or we can use a cable to conect the 3D printer to the computer and send the files.

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Then we use slicing programs and generate the GCODE from the STL format, so the printer understand it. Also the progras tell the amount of plastic is needed. Programs that you could use for slicing are Cura and Slic3r.

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With the 3D software we  save models in STL format (Standard Triangle Language) from programs like SketchUp or Tinkercad. Or download a model designed by other people like in Thingiverse.