By recognizing the limitations of Fused Filament Fabrication (specifically, imperfections or unwanted textures in the surface finish), they came up with a brilliant approach for overcoming this issue. The objects you see above and below are exactly how they look, straight off the 3D printer. I know because I’ve tested them myself! These designs have been released as open source, so anyone can download and print them.
Use their simple and effective design technique, then swap filament colors during your print (pause print, change color, resume print), and you can achieve results like this:
To read about their design approach in detail, please visit Pirate3D’s Blog
To download the “Machine Series” as shown above, please visit Treasure Island