3D model of M. C. Escher's Relativity. Available in OBJ, STL, and FBX format. Model has been successfully 3D printed using the QIDI 3D S-box SLA 3D printer for small scale, but should be possible to print at a much larger scale using an FDM printer at the appropriate orientation.
Model created using Rhino.
STL (Stereolithography, filesize: 15.4 MB), OBJ (OBJ, filesize: 37.7 MB), FBX (Autodesk FBX, filesize: 3.17 MB)