The latest issue (#179) of The Orbital Index featured a picture of X-Bow Systems first test flight. Orbital Index described the rocket (the BOLT) as “retrofuturistic”. I agree and think it will make for a great model rocket design. In fact, X-Bow’s entire fleet (pictured here) makes for great model designs.
More interesting, X-Bow main business is the 3D printing of large solid-fuel rocket engines. Their website doesn’t provide many details, but an article in Defense Brief provides a video from the US Air Force Research Lab (X-Bow’s client) that illustrates the vision on a “solid rocket motor factory in a box”. Definately worth watching at: https://www.youtube.com/watch?v=HtRQ8CVBD-0