The model is made for anti-aliasing the stack is not folded.
Antialiasing modifier is enabled (viewport display – 0 iterations render -1-2 iterations)

Poly: 93339
Verts: 95874

-max 2015 corona
-obj (it is necessary to apply MeshSmooth (1-2 iterations) to some objects)
-mtl
-textures
-material library

For Corona render it is recommended to install version not lower than 1.5 since the glossiness of materials is configured