The file 'LARGE SPIRAL With Fixed Height For Gravitrax – So That It Matches The Height Tiles From Gravitrax 3D Printer Model' is (stl) file type, size is 4.2MB.
The spiral section of the Kugelbahn Erweiterung (Gravitrax compatible) by attmax has a 1mm misalignment between the height tiles from Gravitrax so I made the spiral with a height of 45mm instead of 46mm.