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I'm trying to extrude using the extrude faces along normal, and also trying make a simple E, then S + shift Z to scale on X and Y axis, but its not extruding inwards uniformly. on the cube mesh, its working, but on the more complex model its looking incorrect.

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blender breath
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    Make sure you have scale applied (Ctrl+A > scale) in object mode. Also, make sure you normals are all facing out by selecting the whole mesh in edit mode, then mesh > normals > recalculate outside. If none of that works, make sure you have no dupes by doing a merge by distance. – Christopher Bennett Nov 06 '20 at 04:37
  • Hi Christopher. I tried everything you mentioned, and still get the awkward result. I also noticed when extruding on a mesh which is not scaled inwards, the result is better, but I have noticed that some of the lines tend to curve and others are straight although its just a cube mesh. https://ibb.co/pbScpHT https://ibb.co/Z6VLftv – blender breath Nov 06 '20 at 05:23
  • https://ibb.co/S7xMkS4 – blender breath Nov 07 '20 at 07:35
  • Yeah, that's strange. There must be something else going on, but I don't think I can explain it, I'm afraid. – Christopher Bennett Nov 07 '20 at 08:59
  • I also uploaded a recent example today, in case you missed it, with further more explanation. – blender breath Nov 07 '20 at 10:48
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    in addition to christopher's solution , try to hit "a" and "m" and select "by distance" before try to extrude , also you migh have extra faces inside your geometry , which in resault of wrong modeling , try to delete them by hitting "alt + z" and selecting those faces – hamed.design Sep 10 '21 at 19:46
  • The normals have a lot of different angles at the corners. The Extrude is trying to compensate those angles in a common direction resulting in weird shapes. You can go to Viewport Overlays and enable the Measurement > Edge Angle to see those different angles at the corners. – LeoNas Sep 11 '21 at 01:24

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