Boat created with a custom-built printer and built to fit the owner's height and weight.

Jim Smith, the engineer behind the website Grass Roots Engineering, has created a perfectly usable 3D-printed kayak.

The kayak measures around 17 feet long, weighs about 65 pounds, and cost $500 to make. 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.

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