A 3-D model by me. Available for download in blender versions 2.81a and 2.79b. Everything on this model is perfectly level.
STL (Stereolithography, filesize: 51.9 MB), OBJ (OBJ, filesize: 4.72 MB), FBX (Autodesk FBX, filesize: 4.72 MB), MAX (Autodesk 3ds Max, filesize: 9.44 MB), BLEND (Blender, filesize: 9.44 MB), STP (STEP, filesize: 4.72 MB), JAS (Cheetah3D, filesize: 4.72 MB), ASM (Solid Edge, filesize: 4.72 MB), 3B (3D Coat, filesize: 4.72 MB)