The presented technology comprises a fractal vane structure and a detachable container for the rheometer. The vane rotor consists of a branch-like cross-sectional profile that spreads symmetrically outwards from the center spindle. This fractal layout minimizes projected area, increases surface area contact with fluid, and substantially increases the number of outer contact edges for the vane, creating a more homogeneous stress field. The detachable container is designed with a textured inner surface for enhanced grip of the sample fluid.
Both components for the rheometer can be time efficiently and cost effectively produced by a desktop stereolithography 3D printer, or through other means with further development. Once the instrument is prepared for stress testing, the detachable container can be evenly filled with the yield stress fluid and fastened onto the base of the rheometer. The fractal vane structure then presses into the material, gradually increasing in rotational force. Torque and rotation rate measurements from the rheometer are collected and processed through two composite formulas, which output stress and shear rate calculations for the sample.