Hello, let me introduce you Staircase 3d printable model.
Stl, Obj, Max
Technical dimensions of the model: Tris 1 054 mil
Any format as required
STL (Stereolithography, filesize: 101 MB), OBJ (OBJ, filesize: 83.4 MB), MAX (Autodesk 3ds Max, filesize: 77.1 MB)