There are dozens of finishing technologies can be used for different use cases. If you are not a tech guy, that's ok; you can skip this post. One important thing you should know is that the finishing technologies we used in our 3d printer which is the same with iPhone using.
Sophia is manufactured by using lots of different materials; the main material is the aluminum. The aluminum is a kind of metal that affordable and doable. It's tough and light. It's very suitable for lots of devices. The iPhones and many other hi-end smartphones are using this kind of metal. Because the frame and some other parts are very curial, so we use aluminum to make them.
Aluminum is a sturdy metal, but still weak compared to steel. So some sharp things may sketch the surface of the aluminum. To prevent that, we're using abrasive blasting to strengthen the surface.
Abrasive blasting is a process of surface removal by fine particles of sands, metal, plastic or other abrasive materials. The process will make the surface smoother and remove all the defects from the parts.
After abrasive blasting, the parts' surface will be good, but still weak. So we use anodizing to form a protective oxide layer. The layer will protect and enhance Sophia's parts surface.
Here are some of our parts that have been anodized.
One of the most important parts of the Sophia.
The case after abrasive blasting and anodizing process.