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The top plane would be the black plane and the bottom plane the red planeIncluded Trinity Knot mesh render. I need one side bigger by about 2 pixels though.  Maybe called tapered, beveled?Just for a simple example. Take a standard Celtic Trinity Knot. I want the top (like the black plane in the red/black picture) to be a plane in the shape of a trinity knot. The bottom plane (like the red plane in the red/black picture) should be the same shape but with an extra "thickness". I need this to be a volume so I need the planes connected with side walls. The blue picture is a basic volume made of this shape. In the red and black picture it shows the different sizes of the two planes that I need. I can make the blue picture's volume but I need to know how to make one of the sides slightly "bigger" or "thicker" like shown in the red and black picture. In the red/black picture the planes are overlapped to show how the red plane is "bigger/thicker".

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    $\begingroup$ So do you want a red border like Harry's solution? Or do you want the shape to "grow" from front to back plane? $\endgroup$ Commented Jan 26, 2023 at 8:28
  • $\begingroup$ I need it to "grow" from front to back. The colors were just to differentiate the back from the front. $\endgroup$
    – user161472
    Commented Jan 27, 2023 at 17:45
  • $\begingroup$ Then you can take Harry's answer, select the outlining edges of the extrusion at the front faces, then hit X and choose Dissolve Edges. $\endgroup$ Commented Jan 27, 2023 at 18:28
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    $\begingroup$ Thank you works great. $\endgroup$
    – user161472
    Commented Jan 31, 2023 at 13:35

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Select the faces along the outer and inner perimeters and press Alt+E > Extrude Faces Along Normals

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While you are extruding and moving the mouse inwards, hold down Alt so you get an Even Thickness. Then click to confirm. While the new faces are highlighted, press Ctrl+Numpad+ to increase the selection and Assign the red material to it.

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Here's the final result:

enter image description here

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    $\begingroup$ Thank you works great. $\endgroup$
    – user161472
    Commented Jan 31, 2023 at 13:35

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