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Is there a way to make an arch thicker (i.e. less hollow space) but retain SAME diameter? I created this arch using cylinder -> disable capped ends -> solidify modifier. I've already applied the solidify modifier. If I add another solidify modifier the mesh becomes messed up.

enter image description here

I know I can just create another arch from scratch but want to know if there is another more efficient way.

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Start by placing the 3D cursor exactly at the center of the arch.

Select the outer (or inner) faces only of the cyclinder only.

Press . (Period key) to transform relative to the 3D Cursor position.

Then press S to scale and Shift+Y to exclude the Y axis (adjust according to your own orientation). Now adjust the radius as desired.

Scale

Ideally though, if you want to do it precisely (with accurate measurements) and in a non destructive manner, make your arch paper thin by removing either the inner or outer faces, then use a Solidify modifier instead to add thickness.

Solidify

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You can select the inner part and use AltS. That will scale the faces along their normals.

enter image description here

But as you can see, the center is fallen down (due both to the inclination of the normals and the solidify modifier).

To correct that:

Use snap to vertex and grab Z the selected part:

enter image description here

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