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The following object, in obj format, is 1.6 mm thick and I want it to be 0.8 mm thick. How do I decrease its thickness (from the inside, so that the outward appearance is still the same)? When I go to Add Modifier->Solidify, it only allows me to increase the thickness, but not decrease it.

Note: The suggested previous question does not help me much because I have thousands of faces along the edge to delete when in Edit mode (the original file was obj). enter image description here

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Decrease thickness of object

I have made a half sphere and added some solidify modifier and applied to it. To decrease thickness or shrink down the thickness. In edit mode -> select all and press Alt+S or Mesh -> Transform -> Shrink Fatten

enter image description here

As soon as u click on or better press Alt+S like we scale we get a arrow to increase or decrease the thickness. After click u can press F6 for operator panel or adjustments. Click Ctrl+N to flip normal.

enter image description here

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I guess you could simply select (eg) the internal shell, place the 3d cursor at center, select the pivot method for transforms to "3d cursor" and scale the selection:

enter image description here

here I scaled towards the sphere center

enter image description here

and here the opposite

enter image description here

You can't "snap" the scaling to the "middle" of the current thickness, but you can try to determine the needed scaling somehow: eg, try to scale it by increments (or using vertex snapping tools) until the inner shell matches exactly the outer one, note the scaling factor, and then undo, and scale again using a desired percentage (eg 50% of that to go from 1.6 to 0.8).

here I snapped the scaling to a vertex of the outer shell,

enter image description here

note the scaling in the bottom header: half of that amount, entered by keyboard while scaling, will do the job.

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