A small tower atop a spiraling rocky staircase....
3d model print parameters
No supports required.
For best result on the stairs, use high enough infill (at least 20% on default size) and top layer count. Pay attention how the... stairs lay out on top of the infill so they are supported by it.
At 0.2mm layer height, using 50mm/s printing takes about 2.5 hours.