Penrose triangle pendant (3) (dual extrusion)

thingiverse

Pendant representing a Penrose triangle, an impossible figure that looks real only from one point of view. From other angles, the trick becomes evident due to curved edges. Designed for dual-extrusion printers, with separate STL files provided for blue and white colors. Some areas are filled in both files; when sliced in Cura, this produces alternating blue and white layers, creating an intermediate color on a three-color object. The back side features two variable-diameter holes for attaching rope. To attach, take a thin synthetic rope, put its end into fire, and immediately pull the molten end to make it long and thin. Then insert the end into the hole, drag it through using pliers, tie a knot, cut the excess, and pull the knot back into the hole. This pendant was designed in OpenSCAD with ad-hoc support structures provided. See also versions one and two on Thingiverse.