How can I model this?

[L i am]

Does anyone Know how to model these stair ends?

[nlipovac]

@L-i-am I would try this way:

1. Draw curves flat and weld them together.
2. Copy it vertically, use Vertex tools with Soft selection radius, and adjust the heights of that curve.
3. Use Curviloft - Loft by Spline to make a surface.
4. Use Joint Push Pull to add thickness.
5. Add a cylinder to match the bottom curve, (in my case I use a circle for the last part of that curve).
6. Join them with Solid Tools.

stair_end_v1.skp

[L i am]

@nlipovac Thanks so much, I dont have many plugins and not the ones you mentioned. I used your model thanks again

[Rich O Brien]

@L-i-am You can also try Smoove that is under the native Sandbox menu

[Rich O Brien]

[Box]

You could also try Chris Fullmers Shape Bender. Note how tapping the up and down arrow changes the preview, and then Enter to complete. I through the ellipses in to show how it reshapes things.

[Gus R]

I used CurviShear on the plan view for the curves here then extruded with Eneroth Upright Extrude for the wall. I think your curves might be more helical.

[Gus R]

I think what you want is like a variable pitch helix. The curve of the helix begins from a horizontal plane then begins the helix and at the top the pitch transitions to another horizontal plane. In Sketchup you'd have to mess with the line segments. I tried finding something in Blender and haven't found anything. I'm still a novice with that. It looks like Solidworks and Rhino can do something like that.