These colors offer the capability to mimic the appearance of finished goods, increase visual appeal or distinguish regions of interests. They can also make features more prominent, which is often desirable for adding text, guides and graphics.

1. Considerations

      1.1. Changing material color requires replacing the loaded material canister,
           regardless of whether you are making new parts in a different color or making  
           multi-color parts. 

           A standard material change is accompanied by a tip change and calibration. For
           cases where this is not possible, and there is only a change in material color, a  
           purge sequence may be used (e.g., changing from ASA yellow to ASA blue,
           with no change in slice height or material type).

          FDM multi-color parts can be made when the color delineation is between build
          layers. During the build process, the FDM machine pauses for a material (color)
          change and then resumes to either complete the part or reach a layer where                there will be another color. Each color change requires a purge sequence to  
          remove material from the extrusion tip. This prevents unwanted color transitions
          and ensures the desired color is printed beginning on the selected layer.

For more information, download the full best practices document here.

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