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I want to create a cut in a cube so as to create a hollow pool of water in the middle of the cube. However, when I apply the boolean modifier and remove the object used to cut into the cube, I see no actual difference. The cube is still completely solid. Only in edit mode can I see that a boolean operation has been performed, but unfortunately no hollow area is created. I hope someone can tell me what the issue is here. enter image description here

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    $\begingroup$ could you please share your file with the 2 objects, before applying the modifier? $\endgroup$ – moonboots Nov 7 '18 at 13:55
  • $\begingroup$ Are you sure you used the right boolean operation ? If I understand it well enough, you'd want to use the "Difference" operation for your project. Is that what you used ? $\endgroup$ – AnthoJack Nov 7 '18 at 14:03
  • $\begingroup$ I did use difference. Let me try to share the file $\endgroup$ – maura01 Nov 7 '18 at 14:23
  • $\begingroup$ I think the blend file should be there now $\endgroup$ – maura01 Nov 7 '18 at 14:39
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The problem is the topology of the small cube, it is made of separated faces, so the Boolean operation can't work properly. To solve this, you need to go in Edit mode, select all, and W > Remove Doubles, so that it joins all the faces together and make a real cube. Then your Boolean will work properly.

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If you delete the top face, there is a hole. Perhaps delete the top face then select the vertices to make polygons around it and hit f to make a face? Does that make sense? Result of deleting top face. Selecting vertices Make a face

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