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I'm trying to extrude an area inwards, so that the new boundary is a constant distance from the old boundary. Essentially, the piece now has exactly the same size and shape as the hole that I have, but I want there to be a constant gap between my piece and the hole.

I've looked at this answer, but it doesn't give me what I want.

Here is the original object:

Original

This is a sketch of what I want:

What I want

Here's what I have tried:

Extrude region:

Extrude region - not what I want

Extrude region (vertex normals):

Extrude region vertex normals - not what I want either

Extrude individual:

Extrude individual - also not what I want

How can I get what I want?

Here is my file.

Thanks!

EDIT: Here is what happens if I use the solidify modifier:

Solidify modifier settings

It sort of works, but the distance between the new wall and the old one isn't uniform. This is how it looks like (the distances highlighted in red should be uniform, but they aren't):

Solidify modifier outcome

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    $\begingroup$ Did you try using solidify modifier? $\endgroup$ – Denis Jan 25 '17 at 4:55
  • $\begingroup$ Solidify modifier sort of does it, but distance from the original walls aren't very uniform (see my edit). If there's no better way then I suppose this would have to do. Pardon my lack of skills, I'm new to Blender. $\endgroup$ – Bernard Jan 25 '17 at 5:15
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    $\begingroup$ If you apply the scale of the object that should fix the thickness. $\endgroup$ – Denis Jan 25 '17 at 5:21
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    $\begingroup$ In Object mode, Ctrl+A and choose scale. Denis's combined comments solves your problem. $\endgroup$ – cmomoney Jan 25 '17 at 5:27
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    $\begingroup$ Transformations done in Object mode are not directly applied to the mesh data. Your just basically transforming the "container" of the data. $\endgroup$ – cmomoney Jan 25 '17 at 5:33
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See Properties (N) > Transform > Scale XYZ is not 1 in all axis. Since Modifier transformation is applied first on Object Data and Object Transformation after means Solidifier extrudes thickness and Object Transform squeeze that result.

enter image description here

To solve your issue Apply Scale Transformation (Ctrl+A)

enter image description here

What Object Transform is see this answer or check Manual.

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