This 2 inch frameset is part of Kevin's Design on RotorBuilds. It's the latest revision and should fit the same parts as listed on RotorBuilds. It includes the main frame and a motor mount.
It is printed in Onyx and reinforced with continuous carbon fiber for best weight to stiffness ration while still maintaining flexibility to withstand the hardest of crashes. Onyx is a nylon infused with chopped carbon fibers. The Markforged Mark Two Enterprise on which this part is manufactured is one of the best printers in the industry, with unrivalled print quality and precision.
The parts can also be found on Kevin's thingiverse.This product is a cooperation of Kevin and me, Kevin also gets a kickback from all purchases.