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Every time I try to extrude a face on a plane it has created this hollow shape. I don't think this used to happen and its happening on all my files. How do I fix this? I want a solid to be formed from extruding. I know I can fill the faces but I'm not sure if its an issue with my settings that is causing this?

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  • $\begingroup$ I have tried recalculating normals but that hasn't fixed it :( $\endgroup$
    – antihistamine
    Feb 8 at 15:50
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    $\begingroup$ because the other face needs thickness as well, extrude both, then extrude only the left one $\endgroup$
    – moonboots
    Feb 8 at 16:01

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If you extrude a face, it won't keep the initial face:

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Unless you extrude or all the adjacent faces as well (or unless you extrude a mesh with one unique face):

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If your object has already thickness, as you can see it won't keep the initial face either, otherwise you would need to delete it every time you extrude:

enter image description here

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