arrow fletching 3d model

3D printable arrow fletching that slides onto the end of a pencil like an eraser cap. The model has a hollow cylindrical socket. Internal diameter: 7 mm to fit a standard pencil. Depth of socket: 10 mm. Two feathers, each 3 cm in length, attached to the outer surface of the socket. Watertight mesh. No supports needed for printing. Units: mm.