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enter image description here

as shown on the right side of the picture

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    $\begingroup$ What is the left image? The right image is a concave corner, so it isn't like the left image? What do you mean by "inward folding", concave? $\endgroup$ – Kirbinator Apr 10 '19 at 15:01
  • $\begingroup$ On the right is what I want to achieve. How to create this -90-degree-angle extrude quickly $\endgroup$ – YaoFq Apr 10 '19 at 16:59
  • $\begingroup$ thank you for your kind assistance,my friend $\endgroup$ – YaoFq Apr 11 '19 at 12:49
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I would go around it as to make it while Extrude you will need to place 3D Cursor in right place and Scale extrusion to it.

You can instead make it as such:

  1. Add Solidify modifier with Even Thickness.
  2. Apply it.
  3. Go to Edit Mode.
  4. Select needed faces.
  5. I to Inset.
  6. Delete created faces.

steps

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  • $\begingroup$ After I tried your method and got the result I wanted,thank you my friend! $\endgroup$ – YaoFq Apr 11 '19 at 12:47
  • $\begingroup$ @YaoFq If my answer was helpful consider accepting it and upvoting. $\endgroup$ – cgslav Apr 11 '19 at 20:24

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