In this video, Motley Fool industrials analyst Blake Bos takes a look at the testing phase of the first full LEAP engine on Friday. This engine is slated to be used in the Airbus A320neo, the Boeing (BA 1.76%) 737 MAX, and the COMAC C919, which means investors will want to keep a close eye on the tests to make sure they go smoothly. Blake also discusses the additive manufacturing aspect of this story, also known as 3-D printing, and why there are interesting takeaways for 3-D printing investors here as well. Blake closes by telling investors what he thinks of Boeing stock today.