I'm trying to make a cutout like the following (a hourglass shape) in an object. But when I add the boolean it doesn't fill the mesh. I get a cut out like a cylinder instead. You can see the inside of the object.

There is only a subdivision modifier on the object applied currently. enter image description here

enter image description here enter image description here

  • $\begingroup$ Is your boolean below your subdivision mod in the stack? Also, can you clarify what you mean by fill the mesh? $\endgroup$
    – Michael
    May 27, 2020 at 21:55
  • $\begingroup$ Boolean operations tend to "glitch out" if your meshes are non-magnifold. Fill in the caps of you hourglass mesh and try again. Also, make sure there are no faces in the middle of the hourglass mesh. $\endgroup$ May 28, 2020 at 2:15
  • $\begingroup$ @Michael I"ve updated the post with a photo so you can see where the gap is, you can see inside the shape $\endgroup$
    – AaronSt
    May 28, 2020 at 6:22
  • $\begingroup$ @metaphor_set I've tried it but with no result, i even tried a normal cylinder but got the same result.. $\endgroup$
    – AaronSt
    May 28, 2020 at 16:47
  • $\begingroup$ Have you made sure that all your normals are facing the correct direction? Go into edit mode select everything and hit Shitft+N to recalculate. Also, make sure that you don't have any vertices/edges/faces that share the exact same position with the part to be cut. $\endgroup$
    – Michael
    May 29, 2020 at 20:00

1 Answer 1


I've found the problem, it had to do with the Mirror modifier. When I created the object I deleted 1 face of the object that was on the inside. Which is why it was empty instead of filling.


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