Smith used ABS plastic, machine screws, brass threaded inserts, and silicone caulk to create the whole thing. Smith built the kayak with his home-built large scale 3D printer, which he had to slightly modify to print all 28 kayak parts inside a heated chamber that prevented them from cracking or warping.
Check out this video to see the production process:
The kayaks can also be tailored to a paddler’s size. But the adventurous should proceed with caution when using one of these. It doesn’t appear to have been determined whether they can hold their own against rough rapids.