A big four-bladed throwing star is the kind of prop that is hard to buy and awkward to improvise, and that is the gap this build fills. The maker printed a Demon Wind Shuriken for a coworker's son, which strikes me as a generous reason to spend time on a project like this.
The construction is what makes it interesting. There is a central rotating bearing mechanism, and the bladed structure spins freely around an internal handle that is wrapped in a beige bandage. The four curved blades are split two blue and two off-white, sitting around a circular blue hub. In a first-person demonstration the maker held the prop, spun it, and showed how fingers sit against the inner ring handle, which suggests the grip and rotation were thought through rather than left as an afterthought.
The two-tone coloring looks like a smart choice to me, since it gives each blade its own identity while keeping the whole thing coherent. Beyond this build, the maker has said a Fallout ripper is on the wish list, one where the trigger would spin the chain, so the interest in moving prop parts clearly runs deeper than one project. The design is also being passed around to colleagues at the company, which seems like a good sign that it holds up in other hands.
One open question remains: the specific printer, filament type, and any internal hardware have not been made clear. For a prop with a spinning assembly, knowing what is inside the hub would be useful for anyone hoping to attempt something similar.