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I have a 3d model (.stl) of building and I want to use it in other software. The walls of the model are built with shapes, and I need the walls as volume. There problem is that the model was made by shapes instead of volume.

How can I convert the shape to volume in blender now? any functions?

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    $\begingroup$ You just have to fill the outer edges (the boundary edges loops) with other surfaces in order to achieve a confined volume. There is no such thing as "solids" in B3D mesh editing, only enclosed volumes. $\endgroup$ – Carlo Nov 26 '20 at 16:34
  • $\begingroup$ I tried it but it didn't work, I guess it is because the volumes are not completely closed. I have added the new picture. $\endgroup$ – Wenzheng Cai Nov 26 '20 at 16:48
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    $\begingroup$ Suggest adding a link to stl or a blend file. blend-exchange.giantcowfilms.com $\endgroup$ – batFINGER Nov 26 '20 at 17:18

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