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Okay so I followed this you tube video to make this ring and they way it is done on the video isn't working for me, I am not sure what the problem is. I have tried everything I found on the internet,! advice from author enter image description here

activating the 3D print tool addon and running the solid to check for problems, which it is saying I have some non manifold edges,! enter image description here which are there bc those sides do not have faces because I used a mirror modifier on x and y to complete my basic shape, but I don't know how that could be the problem with the boolean because that is how its done on the video and it works?? my results with boolean(difference) modifier I have done everything i can think of, even rearranging the modifiers,results from the video results from the video I have checked all the normals enter image description here I'm out of things to try, please help?

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    $\begingroup$ Could you upload your .blend? It's hard to say in this case what the problem is without fiddling with the file.. $\endgroup$
    – gandalf3
    Jul 15, 2014 at 19:13
  • $\begingroup$ I would love to, just have no idea where to upload it on this site? Help please?lol $\endgroup$ Jul 16, 2014 at 2:32
  • $\begingroup$ You can't currently, instead you'll have to use pasteall or something and put the link here. $\endgroup$
    – gandalf3
    Jul 16, 2014 at 2:33
  • $\begingroup$ Okay here it is thank you so much for your help, I learned something new! pasteall.org/blend/30443 $\endgroup$ Jul 16, 2014 at 17:41

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Boolean operations sometimes fail when vertices between the two objects line up exactly.
You can work around this by moving one of the objects a very small amount.

Example .blend

Also see “Cannot execute boolean operation” when subtracting several spheres and cylinders from cube

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  • $\begingroup$ Thanks a million gandalf3, I finally got it!! Here I thought it was a setting or something...lol $\endgroup$ Jul 17, 2014 at 14:22
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I too am building up a ring and ran into this very problem.

Here are some things to check:

  • Check your mesh for doubles
    • select all
    • (Blender 2.8) Mesh > Clean Up > Merge By Distance
  • Check that your meshes are Manifold
    • This one has usually been my culprit
    • Go to edit mode
    • Select none
    • Ctrl + Alt + Shift + M
    • This will highlight any non-manifold geometry
    • you will then need to find a way to fix it (google is your friend)
    • in my case, it was being created in previous boolean modifications

Tip: When doing boolean modifiers, I have found that the Carve setting helped create Manifold geometry. This helps if you are doing successive boolean modifications, since I've found that non-manifold geometry behaves poorly with subsequent Boolean Modifiers.

Good luck on your journey, I hope it goes well!

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