This stylish blue knurled ring, sized at 5.5 with a precise 16mm inner diameter, is ideal for custom 3D printed components and functional accessories. Its textured exterior provides a firm grip, whereas the smooth inner surface ensures a seamless fit. Perfect for 3D printing enthusiasts who wish to enhance their projects with both style and functionality—whether used as a knob, adjustment ring, or decorative element. Print it using your preferred material to elevate any design with this compact yet impactful piece.