Spectre: a chiral aperiodic monotile by divbyzero

This 3d-printable tile is based on the one discovered by David Smith, Joseph Samuel Meyers, Craig S. Kaplan, and Chaim Goodman-Strauss in May 2023 (see: https://arxiv.org/abs/2305.17743). It is an example of an "einstein"—a single shape that tiles the plane aperiodically. Unlike their earlier tiles—the "hat" and the "turtle"—this tile, which the authors call a "spectre" does not require any tiles to be flipped upside down in order to tile the plane aperiodically. (In fact, if we allow reflections, then it is possible to tile the plane periodically with the spectre tile.)