I've seen plenty of examples of "printed" parts - from prototypes of the Tread watch to miniature engine parts. But so far they are mostly for concept, not for function. And to me, they appear porous. They often need a finish for visual appeal.
Prototypes are produced without any support flanges or trimming, and with excellent up facing and down facing surfaces. A variety of materials, including clear, are available. Prototypes are best suited for applications where accuracy, detail and surface finish are important and the part fits within a 5" x 5" x 5" (127mm x 127mm x 127mm) build volume.
That's good for a watch!
Typical applications for prototypes include electronic components and connectors, electronic packaging, knobs, buttons, medical devices, fittings, valves and parts with complex interior features. It has also been used for tooling in low-temperature applications. It makes an excellent mold with releasable surfaces without requiring a secondary process for non-cosmetic applications.
Etc etc
Cazalea