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I want to create four symmetric holes from one along two axis. While the object(a box) itself is fully symmetric along the Y axis, but is only partially symmetric along the X-axis, so I can't just use one mirror modifier and select both X and Y axis of symmetry. See the picture:

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What is the proper way to deal with the partial symmetry along the X-axis and create the second symmetrical hole on one side of the box? At the end I want to have this - if I change the original hole - all other 3 holes change itself automatically.

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  • $\begingroup$ add a bolean with the difference object set to a cylinder, and apply a mirror modifier on the cylinder with the box object set as the mirror object $\endgroup$ – Alex bries Nov 12 '20 at 22:28
  • $\begingroup$ could you, please, provide some screenshots? $\endgroup$ – user1876484 Nov 12 '20 at 22:51
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icosphere cut by a cyclinder

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cylinder is mirrored along icosphere

enter image description here enter image description here

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You could use the Mesh > Symmetrize tool (choose the axis in the Operator box on the bottom left of your 3D view):

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Once done, you'll need to make sure that you don't have ripped edges like this:

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To fix that, add some edge loops with the knife tool and merge the vertices:

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  • $\begingroup$ Thank you! What is the point of adding extra edges? And why should they be loops? $\endgroup$ – user1876484 Nov 13 '20 at 13:13
  • $\begingroup$ I've edited my answer, once you've symmetrized you need to make sure that you have a good topology, I hope it's clear $\endgroup$ – moonboots Nov 13 '20 at 13:21

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