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So this is the shape I want to cut into another "wall" shape. You'll notice the back ridge of the cylinder shape. That is the part that isn't cutting properly.So this is the shape I want to cut into another "wall" shape. You'll notice the back ridge of the cylinder shape. That is the part that isn't cutting properly

This is where I have positioned the shape inside the "wall" shape.This is where I have positioned the shape inside the "wall" shape

The settings I used and applied for the Boolean modifier. The settings I used and applied for the Boolean modifier

Now this is the result of the Boolean in the solid view. That back ridge doesn't show up at all.Now this is the result of the Boolean in the solid view. That back ridge doesn't show up at all.

When I use orthographic view I can see it. When I use orthographic view I can see it.

But if I use xray mode I can see it.But if I use xray mode I can see it.

Again it shows up in the wireframe view when I look into the "wall" shape.Again it shows up in the wireframe view when I look into the "wall" shape But not when I look at it on wireframe view from the outside.But not when I look at it on wireframe view from the outside.

Anyone have any ideas on what's going on?

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Because you use just two joined cylinders as the boolean object (can be seen in your sixth screenshot). This is not a valid manifold. You either apply the cylinders separately with two Boolean modifiers or you model one valid manifold and use that.

enter image description here

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  • $\begingroup$ Interesting, thanks. Is there a reason why two joined meshes aren't valid? $\endgroup$
    – molewart
    Commented Sep 10, 2023 at 0:07
  • $\begingroup$ A manifold is valid if it forms a single volume. This can't be the case when you only join two meshes. Even if they would perfectly fit at their (open) borders, you would at least have to merge the overlapping vertices afterwards. $\endgroup$
    – taiyo
    Commented Sep 10, 2023 at 0:16

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