As described in Smith, D., Myers, J. S., Kaplan, C. S., & Goodman-Strauss, C. (2023). An aperiodic monotile. arXiv preprint arXiv:2303.10798.

Unlike some other models that are derived from Craig Kaplan's interactive tiling toy, the OpenSCAD source of this model calculates its own precise coordinates for the tile vertices.

The 3d model provided here is only 0.6 mm thick. While it prints quickly, a thicker model would fit together better