Inset
The Inset tool is similar to the Extrude tool, but the new faces it creates are on the surface of the selection and will not change the surface’s shape. This tool generates a copy of the geometry that is an inset of the original selection (it’s possible to also add height to the new geometry). This tool only works with faces (see Figure 6.13).
To use the Inset tool:
1. Select a face or group of faces.
2. Press I to Inset.
3. Drag the mouse to increase or decrease the inset’s thickness. Press Ctrl while dragging to change the height of the inset. ...
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