When designing the SiGZiG usb logger, we deemed the quality of the case as highly important to help with noise reduction, durability, coolness factor, and to reflect the internal build quality. Some told us that we should go the plastic route, but that has already been done for decades by the current manufacturers.
While our first prototype cases came from Protolabs (great for quick-turn prototyping), we had to search for a more cost-effective solution for mass production. Working with different manufacturers on case materials, coatings, sandblasting, metal injection molding, machining, and anything else they/we could think of, we are getting some pretty great results.
Here is the latest batch of test cases. Enjoy!